/dev/chat

Faheem Mitha

12:29 AM

@casey Thanks.

Braiam

1:52 AM

can we delete this? unix.stackexchange.com/q/4248/41104

derobert

2:19 AM

Wow. I actually read through this several pages of drivel:

-2

A: Fluctuating wifi signal and random disconnects rtl8192ce

WOW! DO NOT GO BLACKLIST CRAZY!! THATS LIABLE TO SHUTDOWN THE ISA MAN!! I have the same issue on a box that I have that is ~75 feet from the router at my residence. My desk, and consequently the box is in the attic (converted space), the router is completely southeast of my boxes location, Seatt...

Is the answerer really that clueless, or just a troll?

Ramesh

2:49 AM

Does that answer make sense? I couldn't read the entire answer actually. It is so long.

How come community has 3 reputation?

derobert

3:05 AM

@Ramesh Well, I described it as "several pages of drivel" and asked if he/she is "really that clueless, or just a troll"... So, I hope you know my answer to that!

@Ramesh Where does Community have 3 rep? Sounds like a bug.

unix.stackexchange.com/users/-1/community

only shows 1 rep as expected

Ramesh

@derobert the first question in U & L meta says community's rep as 3.

derobert

@Ramesh Are you talking about the 3 to the left of "Do we need version specific tags for distributions?" in "Hot Meta Posts" on the main page? If so, that's the score of that question...

Oh! I see

meta.unix.stackexchange.com/users/-1/community indeed has three rep. I guess that's a bug.

Feel free to report it.

Ramesh

@derobert thanks. Posted it as a question.

derobert

3:20 AM

Maybe we can get Community up to 20, and invite him/her/it to chat.

Ramesh

ha, and then bring him/her to 125 and let them dv spam answers as well.

Faheem Mitha

8:14 AM

@derobert :-)

Faheem Mitha

8:27 AM

@derobert Do you (indeed anyone else) have a reference for when to use this da partition thing? What does it do? I have found some scattered references to it, but nothing useful.

Actually, this howto suggests using fd (for RAID autodetect, apparently)

howtoforge.com/software-raid1-grub-boot-debian-etch

Is it worth doing

mdadm --zero-superblock /dev/sdb1

as mentioned in that howto?

Faheem Mitha

9:03 AM

Some discussion about this here - bbs.archlinux.org/viewtopic.php?id=157993

slm

@Ramesh @derobert I was looking into the rep of 3 for community BTW

Faheem Mitha

Woonsocket here is Rod Smith. He recommends using fd (RAID type), which sounds reasonable.

I guess he should know.

@derobert ^^

@slm Is that a bug?

@slm opinion about filetype for sw RAID array?

slm

@Ramesh @derobert - doesn't appear to be a bug. I'll write up an A on meta.

I always set it but believe it doesn't matter

Faheem Mitha

@slm oh.

@slm You always set what?

slm

the filetype for a aw RAID

you mean partition type, right?

Faheem Mitha

9:14 AM

@slm right

you mean you can set it to anything?

slm

yeah, I think this came up here before.

Faheem Mitha

@slm On this site? Got a link?

slm

sounds familiar to me, but like I said, I always set it but don't think it causes an issue with mdadm

it 5am here and I'm gonna write up the meta and go to bed

have to get up w/ my kids in 2.5 hrs

we discussed it this year if my memories right

a few months ago

Faheem Mitha

@slm what do you set it to?

@slm sheesh

I hope you get more than 2.5 hrs of sleep a night.

I think I'll write a question. As you say, it probably doesn't matter, but it would be no worse than most of the questions we get here.

slm

most of the time, but I've been busy with my new job.

plus tonight I had a hockey game that ended around 12:30

Faheem Mitha

9:17 AM

@slm busy

I did a search, but didn't see anything directly addressing it.

slm

1 17.4kB 3001GB 3001GB primary raid

output from parted -l

Faheem Mitha

@slm so you set the filetype to raid, then?

slm

Model: ATA ST3000DM001-1CH1 (scsi)
Disk /dev/sdb: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name     Flags
 1      17.4kB  3001GB  3001GB               primary  raid

yeah but that's got a code, which is fd (in a MBR style disk) - "fd Linux raid auto"

you can see the types in fdisk with the L command

Faheem Mitha

@slm right. that seems to be what (some) people recommend. Including Rod Smith, apparently.

Well, have a good (short sleep).

slm

his name came up is why I remember it

Faheem Mitha

9:22 AM

This is a good question.

8

Q: Difference between UUID from blkid and mdadm?

Can someone explain the difference between the UUID's reported by blkid and mdadm? On one of our CentOS systems, for example: [root@server ~]# blkid | grep /dev/md1 /dev/md1: UUID="32cb0a6e-8148-44e9-909d-5b23df045bd1" TYPE="ext4" [root@server ~]# mdadm --detail /dev/md1 | grep UUID UUID : f204...

@slm in the discussion?

slm

unix.stackexchange.com/search?q=Rod+Smith

Faheem Mitha

Apparently Stephane knows everything and is never wrong, as far as I can tell.

@slm ok

slm

0

A: Filesystem types for encrypted partitions

The “filesystem type” in a PC partition is actually a volume type, or more precisely a usage type: it's really supposed to indicate which operating system the partition belongs to (e.g. Windows vs Solaris vs FreeBSD), and what it's supposed to do with it (e.g. nested partition of some kind vs fil...

As gilles states it, it's just a convention

Faheem Mitha

9:40 AM

@slm I see. But it is a cross-OS convention, with no standardized conventions? Stellar.

I feel the urge to link to xkcd. Must resist...

@slm Thanks for the information. Have a good nap.

slm

yes they served some purpose back in the day but now really do not.

ok I'm going to bed

Faheem Mitha

There is a lot of stuff around the Linux kernel and related utilities that isn't properly documented, including good usage practices. So we are reduced to guessing.

@slm Take care. Sleep well.

Braiam

12:08 PM

Each time someone mistype kernel as kernal, I kill a kitten.

slm

12:28 PM

nice

Faheem Mitha

@slm I thought you were sleeping. :-)

Braiam

12:53 PM

@FaheemMitha that was 2 hours ago

slm

1:16 PM

@FaheemMitha awake now

time for work

had to get up and get my kids ready for their summer camp

Faheem Mitha

@slm Sounds like a rough night. Take care, try to get some sleep, and drive carefully. You don't want to get into any accidents.

You're in Florida, right?

slm

No I'm in Rochester now. I work out of my house now so no where to drive 8-)

I was in FL 2 weeks ago

in FL 7/13 - 8/1

ArchKudo

Does anyone now a nice tutorial for making a build tools for gedit

slm

what kind of build tool?

ArchKudo

@slm sorry my bad!!

Braiam

1:22 PM

@ArchKudo you mean plugins?

ArchKudo

Nope more like sublimetext.info/docs/en/reference/build_systems.html for gedit

slm

@ArchKudo - seems like there are many options already available to you. Depending on your language you could use Ant or Maven for Java. You could also use Jenkins

Braiam

different names, same function, here's what you are looking for wiki.gnome.org/Apps/Gedit/PythonPluginHowTo

slm

would need to know more specifics to provide anything more useful

ArchKudo

Specifically for C ??

Will this help, more like make{some piece of code through gcc / clang}

Braiam

1:25 PM

@ArchKudo sublime seems to have an API specifically designed to run external tools, gedit doesn't so it relies on plugins

@ArchKudo code.google.com/p/gedit-plugin-make-and-run

slm

Sorry I missed that you updated your Q to add gedit

wiki.gnome.org/Apps/Gedit/Plugins/ExternalTools

ArchKudo

Ooh nice !! @slm

slm

yup, that sounds like what you want

ArchKudo

Thanks a lot @Braiam and @slm

slm

yup

If you get it working you might want to come back and write up a Q and self A with your findings

some screenshots would make for a nice little tutorial

ArchKudo

1:28 PM

Ya Sure !!

Faheem Mitha

@slm ok, that's good.

Ramesh

1:52 PM

@FaheemMitha @slm never sleeps :)

Faheem Mitha

@Ramesh I thought that was Argus.

Ramesh

@FaheemMitha Argus?

Faheem Mitha

Argus Panoptes

Argus Panoptes (or Argos) is the name of the 100-eyed giant in Greek mythology. == Mythology == Argus Panoptes (Ἄργος Πανόπτης), guardian of the heifer-nymph Io and son of Arestor, was a primordial giant whose epithet, "Panoptes", "all-seeing", led to his being described with multiple, often one hundred, eyes. The epithet Panoptes was applied to the Titan of the Sun, Helios, and was taken up as an epithet by Zeus, Zeus Panoptes. "In a way," Walter Burkert observes, "the power and order of Argos the city are embodied in Argos the neatherd, lord of the herd and lord of the land, whose name itself...

derobert

2:35 PM

@FaheemMitha The 0xDA partition type is in the mdadm manpage

@FaheemMitha And you definitely should not zero superblocks after creating the array.

@FaheemMitha That discussion is about GPT disks. You're using MBR partitions.

Faheem Mitha

Hi @derobert.

Ok, noted.

derobert

@slm GPT doesn't use type codes. It uses GUIDs. gpart displays the GUID for mdraid as fd00 because GUIDs are huge and not really user-friendly.

Faheem Mitha

@derobert Which discussion is that?

derobert

@FaheemMitha The one it's in reply to... bbs.archlinux.org/viewtopic.php?id=157993

Faheem Mitha

"When creating a partition based array, using mdadm with version-1.x metadata, the partition type should be set to 0xDA (non fs-data). This type
selection allows for greater precision since using any other [RAID auto-detect (0xFD) or a GNU/Linux partition (0x83)], might create problems in
the event of array recovery through a live cdrom."

I see. Does anyone know what they mean by this, exactly?

Rod Smith didn't seem to agree, though.

What is Word of God on this?

derobert

2:46 PM

@FaheemMitha Possibly, you should head to a temple/church/etc., offer some sacrifices, and spend a few days praying to find out?

But one comes from the authors of mdadm (presumably, as its in their manpage) ones comes from some random other dude...

That Brazilian Guy

Hello.

How do I make the --text in zenity --text='<text here>' --warning point to a disk file?

derobert

@ThatBrazilianGuy questions... go on the main site. But the obvious way would be to have the shell do a substitution, if there isn't an option in the manpage for that.

But it appears there is an option for that in the manpage

Faheem Mitha

@derobert Not really an option. Since I don't do religion.

That Brazilian Guy

I don't speak shell script.

Where is the man page for the shell located?

derobert

@FaheemMitha Same here. We'll need to find a theist to get the Word of God, then.

Faheem Mitha

2:50 PM

And sacrifices are so Middle Ages. Except human sacrifices.

derobert

@ThatBrazilianGuy man page for zenity. man zenity

That Brazilian Guy

Oh.

Faheem Mitha

@derobert Or we could ask Linus Torvalds. Which pretty much amounts to the same thing.

derobert

@FaheemMitha Nah. He doesn't write the RAID stuff, AFAIK.

Faheem Mitha

@derobert Good point, though I thought Rod Smith was some sort of authority?

@derobert But he knows everything. Or so I hear.

Kind of like Stephane, but with a Finnish accent.

mdadm seems to be mostly Neil Brown, who might work at suse, judging by his email.

Ty221

2:56 PM

0

Q: Gallium renderer used instead of Intel Mesa

I have got GPU (Intel Haswell HD4600) performance troubles on my Debian. I installed driconf, because I read it can help. When I ran it from my user account I saw my default renderer is Gallium (VMWare), but when I ran it from root - Mesa Intel Haswell. I think my troubles with performance could ...

linux debian graphics troubleshooting intel

Please take a look on that

that is strange error for me

derobert

@FaheemMitha spinics.net/lists/raid/msg19905.html

]spinics.net/lists/raid/msg20184.html

Ty221

I try to fix my graphics since January!

Faheem Mitha

@derobert Impressive detective work. You should moonlight as a sleuth.

But Neil is not very specific here. I'm tempted to write and ask him if he is being deliberately cryptic. Or perhaps it's a secret?

derobert

@FaheemMitha Cryptic? You can see the eventual result of that in the mdadm manpage, it's recommended to use 0xDA

Faheem Mitha

"I suspect 0xDA is safest and hence best." Why?

@derobert Yes, I just quoted it here. Sorry, I just like being difficult sometimes.

Feel free to ignore me.

derobert

3:01 PM

@FaheemMitha 0xFD was used for 0.90 superblocks for in-kernel auto-assembly. Using the normal Linux FS type might result in stupid utilities mounting half of a RAID1. Look at the second message...

Faheem Mitha

Looing at thread now. Wow, that's a lot of messages.

"I don't want md trying to autodetect and complaining so, as you say, 0xfd is out."

"The subject pretty much says it all - it obviously is not 0xFD, since there is nothing to autodetect."

Nothing to autodetect?

"Nobody really cares about the partition type these days. I usually
stick to the default 83 (Linux) for software raid partitions and
never encountered any problems."

"This is a very flawed assumption. You will be surprised how many utilities/live CDs are there in existence, which will selently attempt to mount/fsck a partition based solely on its type. The implications of a commenced mount/fsck on a raid component are not to be uttered here :)"

Ty221

Does anybody can help me ?

Faheem Mitha

So, perhaps the issue is some tool trying to automount when it shouldn't be auto-mounted?

derobert

@FaheemMitha 0xFD autodetect was a feature of 0.9 superblocks

Faheem Mitha

@Ty221 Your question could use some elaboration. You refer to vmware once with no explanation. Can you elaborate on how this fits in your setup - in the question?

@derobert And no longer?

derobert

3:08 PM

@Ty221 Honestly... I have no idea. Unless you're running under vmware.

Faheem Mitha

@Ty221 is your debian inside vmware?

if so, that's an important detail.

derobert

@FaheemMitha Still is, AFAIK. Shouldn't in general be used. But you're using 1.2 superblocks, not 0.90.

Faheem Mitha

@derobert No, i mean this autodetect does not happen with 1.2?

derobert

@FaheemMitha Correct. 1.x superblocks require mdadm to assemble.

Faheem Mitha

@derobert I see.

Ty221

3:12 PM

@FaheemMitha No

Faheem Mitha

@Ty221 OK, but then tell us how vmware fits into this.

Ty221

My Debian installed as main OS in my laptop

Faheem Mitha

@Ty221 Ok

Ty221

@FaheemMitha Because gallium renderer is developed by vmware

Faheem Mitha

@Ty221 No idea what that is, sorry. Can you give more details?

Ty221

3:14 PM

E.g. when i run glxinfo | grep 'renderer string' from my account I see:

Faheem Mitha

This sounds like something that might be better in a specialised forum.

Ty221

OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits)

But from root:

OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile

Looks like root and my account are using different renderers and I do not have access to graphic card

Faheem Mitha

@Ty221 Sorry, I have no idea. Could you ask maybe in an opengl list?

Ty221

Maybe I will try

See that:

google.pl/search?q=gallium+renderer+instead+of+intel+meas

slm

@derobert yeah I knew that, it was 5am and I was giving as little effort as I had to to provide a lead

Ty221

3:17 PM

There were similiar issues

I tried to follow hints

But no effect

Faheem Mitha

@Ty221 So: "i resolved this by adding my user to the video group and restarting x it was just a permission problem" does not work?

Ty221

I tried usermod -a -G video tymon

But no effect unfortunately

Faheem Mitha

@Ty221 That's not the right command for Debian.

Ty221

What should I do?

groups tymon gives me:

Faheem Mitha

You do: adduser username video, I think

Ty221

3:22 PM

tymon : tymon cdrom floppy audio dip video plugdev scanner bluetooth netdev

Faheem Mitha

Are you currently in the video group or not?

Ah, ok.

I think you have to log out and back in again to get that to take effect, though.

In this case you might have to restart X too.

Ty221

I restarted OS

Do I have to restart X also?

@FaheemMitha ?

?

casey

If by "restarting the OS" you mean you rebooted, then X was restarted in the process

Faheem Mitha

@Ty221 X would restart if you rebooted Debian.

Ty221

restart in my language means reboot :)

Faheem Mitha

3:31 PM

@Ty221 adduser is preferred to usermod because it is Debian-specific. Just fyi.

Ty221

Ok

Faheem Mitha

Though usermod may work fine. I haven't studied the specifics.

Though it does smell like a permissions issue.

@casey what you do think?

What is this renderer thing, anyway?

Ty221

Hmmm...

Faheem Mitha

Wow, looks like neil brown has been doing mdadm for a while. The first commit is dated 2001, by him, and so are the most recent ones.

Ty221

I heard Gallium is really slow

And Mesa much faster

That's why I want to change that

Faheem Mitha

3:34 PM

If you user is doing one thing, and root another, then a permission issue is quite likely.

Ty221

Ok

Do you have any idea how to solve it?

Faheem Mitha

@Ty221 exercise. do you have access to other user accounts on this machine, or can you create one?

Ty221

Yes

I will create one more

Faheem Mitha

If so, try another user account, or better still, create a dummy user account.

Can anyone elaborate on what this renderer thing is?

Ty221

Yeah, I created new account

Please wait I have to relogin

'll come back in 3 minutes

Faheem Mitha

3:36 PM

Is it basically the same as a X driver?

derobert

@FaheemMitha OpenGL

Faheem Mitha

@Ty221 ok

@derobert hmm, ok

derobert

mesa3d.org/llvmpipe.html

So for some reason his normal user can't talk directly to the graphics hardware.

Or at least isn't, and is using CPU-based rendering instead.

Faheem Mitha

@derobert what is CPU-based rendering? You mean some sw fallback?

derobert

Yes.

Faheem Mitha

3:38 PM

IOW, the regular computer cpu is emulating what the graphics hw should be doing?

Hmm, that should be possible to debug.

Actually knowing something about opengl and gpus would help.

derobert

@Ty221 maybe try strace -e open glxinfo 2>&1 > /dev/null | less and see if you're getting some permission denied errors?

casey

@FaheemMitha CPU-based rendering is the same as software rendering. Software is emulating GPU hardware. Slow by definition.

Ty221

Ok

derobert

Or check permissions on /dev/dri/*

Ty221

I run driconf from new account and saw Gallium

casey

3:41 PM

"CPU-based" on its own is bit ambiguous to me since that can be interpreted as on on-die GPU

Ty221

then ran adduser nowy video

and restarted lightdm

casey

but I take it be non-accelerated software rendering

Ty221

And still I was seeing gallium

casey

2 mins ago, by derobert

@Ty221 maybe try strace -e open glxinfo 2>&1 > /dev/null | less and see if you're getting some permission denied errors?

Ty221

There are some no file found error

derobert

3:46 PM

@Ty221 What about the stuff in /dev/dri ... does it manage to open those?

Ty221

open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGLEW.so.1.10", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGLU.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGL.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libX11.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libXext.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3

There is nothing like /dev/dri

gist.github.com/ty221/c9d130a4b4516544c2ae

I do not whats the problem

derobert

@Ty221 do the same as root, and let's see the difference

Faheem Mitha

I don't think the unix kernel exposes the video card directly, afaik. Is the GPU different?

Ty221

Results from sudo: gist.github.com/ty221/1dbd7ea77094a6045112

open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGLEW.so.1.10", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGLU.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libGL.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libX11.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/x86_64-linux-gnu/libXext.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3

derobert

@Ty221 And that one says its using Mesa???

Ty221

3:51 PM

I the command results probably not

But in driconf

It shows

(root account)

Faheem Mitha

@Ty221 can you do a diff -u between the two files? it would be easier to see the difference.

Ty221

Here you are:

derobert

@Ty221 what do you get for ls -al /dev/dri/ ?

Faheem Mitha

One is open("/etc/drirc", O_RDONLY) = 4 and one is 5. What do these numbers mean?

derobert

@FaheemMitha Those are the file descriptors.

open("/usr/lib/x86_64-linux-gnu/libICE.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/home/anthony/.Xauthority", O_RDONLY) = 4
open("/dev/dri/card0", O_RDWR|O_CLOEXEC) = 4
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 5
open("/lib/x86_64-linux-gnu/libudev.so.1", O_RDONLY|O_CLOEXEC) = 5

... that's the section on my Ivybridge machine.

Ty221

3:54 PM

@derobert:

drwxr-xr-x 2 root root 80 sie 15 10:54 .
drwxr-xr-x 20 root root 3420 sie 15 17:30 ..
crw-rw----+ 1 root video 226, 0 sie 15 16:50 card0
crw-rw---- 1 root video 226, 64 sie 15 10:54 controlD64

(results of: diff -u noroot.txt root.txt

--- test.txt 2014-08-15 17:52:40.797183579 +0200
+++ test2.txt 2014-08-15 17:52:35.465405257 +0200
@@ -32,15 +32,27 @@
open("/usr/lib/x86_64-linux-gnu/libICE.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/home/tymon/.Xauthority", O_RDONLY) = 4
-open("/usr/lib/x86_64-linux-gnu/dri/tls/swrast_dri.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
-open("/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so", O_RDONLY|O_CLOEXEC) = 4

derobert

@Ty221 if you look in /var/log/Xorg.0.log, is there something along the lines of: [ 18.896] (II) xfree86: Adding drm device (/dev/dri/card0)

Ty221

Do I have to give you any other log?

[ 3762.787] (II) LoadModule: "extmod"
[ 3762.788] (II) Module "extmod" already built-in
[ 3762.788] (II) LoadModule: "dri"
[ 3762.788] (II) Module "dri" already built-in
[ 3762.788] (II) LoadModule: "record"
[ 3762.788] (II) Module "record" already built-in
[ 3762.788] (II) LoadModule: "dri2"
[ 3762.788] (II) Module "dri2" already built-in
[ 3762.788] (II) LoadModule: "glx

Faheem Mitha

what do /root/.drirc and /home/tymon/.drirc look like? Any differences?

Ty221

and nothing other with dri

Faheem Mitha

Ok, so does anyone know what these file descriptor numbers signify, exactly?

derobert

3:58 PM

@FaheemMitha Nothing. They're just numbers that the kernel uses to track open files.

Faheem Mitha

@derobert oh

derobert