RE: [gentoo-dev] SMP kernel halts system - hyperthreading??

[Denis Shcherbakov]

Hm.  I guess this is the kernel issue then, huh.

Tido- I have a very similar machine.  Not Dell, though.  It's got a Dual
Tyan mobo in it, 2 2.2-GHz Intel Xeons (with hyperthreading), 2 GB of
RDRAM, and a couple IDE hard drives.

Yea - I think there are possibly some sort of scheduling conflicts
happening on my machine.  I use 2.4.19-gentoo-r7, and it was stable until
I started running codes from a C++ numerical package.  I asked the guys
who wrote it, and they are saying that they run these codes all the time
on SMP machines with stock RedHat 7.x installations and Debian boxes with
no incidental hard-lock failures like I have seen.  I have updated glibc
and libc to the latest gentoo ebuilds, where I thought the problem was
initially.

Now since a lot of people are blaming it on the 2.4.19-gentoo-r7 kernel, I
might as well join the list, if this software is proved stable on other
distros using stock SMP kernel from kernel.org.

I guess maybe I should just go with the vanilla's now, since they have
been reported not to have these kinds of issues.

Denis

On Fri, 20 Dec 2002, Ciaravino, Tido wrote:

i've been tracking similar issues with the new 1.4 boot CDs

see gentoo bugzilla bug 11095 (and vote for it!!!)

short version:
i've gotten it to work properly with the vanilla-sources
and xfs-sources - but something in the gentoo-sources
causes my machine to lock hard (regardless of hyperthreading)

My boxes are Dell PE2650 with dual 2.4G xeon 2Gig Ram & aacraid (xfs on top)
(hyperthreading can be turned on/off in the bios)

Hope this helps,

odiT

-----Original Message-----
From: Riyad Kalla [mailto:rsk@×××××××××.edu]
Sent: Wednesday, December 18, 2002 10:50 PM
To: 'Denis Shcherbakov'; gentoo-dev@g.o
Subject: RE: [gentoo-dev] SMP kernel halts system - hyperthreading??


Denis,
That sounds like the server at work I'm using, nice machine..

Anywya, there was a thread on something like this in the forums, and it
basically turned out to be the SMP Gentoo kernel, the guy went to
vanilla kernel and everything worked just dandy. Can you verify this?
Maybe the kernel team needs to focus on something?

Can you run 4 threads of Seti@Home to see if it kills the machine? That
should be a good test as it will saturate your CPUs

Best,
-Riyad

-----Original Message-----
From: Denis Shcherbakov [mailto:deniss@×××××××××.EDU]
Sent: Wednesday, December 18, 2002 8:47 PM
To: gentoo-dev@g.o
Subject: [gentoo-dev] SMP kernel halts system - hyperthreading??



Dear gentoo-dev,

If some of you recall, I wrote to the list about a system halt resulting
from running C++ codes and it possibly having to do with nVidia graphics
or XFree 4.2.1.

Well, the problem persists in text mode also.  It happens when 3 or more
CPU-intensive processes run simultaneously on the machine.  I have an
SMP
kernel (2.4.19-gentoo-r7) with 2 Intel Xeon 2.2-GHz processors equipped
with hyperthreading technology.

I have 4 processors initialized at boot time, and 4 processors show up
in
"top".  This is probably because of hyperthreading, as otherwise there
should be only two.

How do I turn off hyperthreading?  Do you think hyperthreading is what's
breaking my system and it could be more stable without hyperthreading?
Can a certain process be confined only to a certain processor?

Thanks for any help!
Denis


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