Re: [Linux-ia64] Preempt problems

From: Ray Bryant <>
Date: 2003-02-15 08:04:52

We're using a 2.4.19 kernel with a number of patches and SGI fixes, and
some backports from 2.5, as well as our machine 
specific stuff.  A more complete description of what we run is:

--2.4.19 from
--IA64 patch
--Atlas patches including discontinguous memory support, VM support
--O(1) scheduler -- including some fixes for large CPU counts, etc
--SGI machine specific H/W support
--SGI patches and fixes for bugs and scalability
--CSA (Comprehensive System Accounting)
--XSCSI (our version of SCSI support from IRIX -- this is a
module/closed source)

Of interest for this discussion is the O(1) scheduler and perfmon.

If you could send me your patch, I will take a look at it and see what

We will eventually be going to RHAS, but at the moment we are running a
"free-bytes" clone of RH 7.2.

I understand exactly why you are trying to keep the number of variations


Stephane Eranian wrote:
> Ray,
> On Fri, Feb 14, 2003 at 02:05:53PM -0600, Ray Bryant wrote:
> >
> > Does the deadlock you describe here look at all like the bug report that
> > Jack Steiner has submitted for our Altix kernel?
> > (We're using the O(1) scheduler and pfmon.)  (It certainly sound
> > similar.) Details attached.
> >
> > Is anyone working this issue that you know of?
> >
> This problem was reported to me by Intel and others. It was affecting
> the 2.5 kernel only. However given that RHAS 2.1 is also using the
> O(1) scheduler, I had to fix it in 2.4.18/RHAS. I don't exactly
> know which kernel you are using at SGI. Note that the fix has been
> propagated to 2.5.60 as well. I can provide the patch to you but
> note that it also includes updates to perfmon to bring it closer
> to what we have in 2.4.20. My  goal is to minimize the number of
> variations out there ;->
> --
> -Stephane

Best Regards,
                  Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)   
The box said: "Requires Windows 98 or better",
           so I installed Linux.
Received on Fri Feb 14 13:03:31 2003

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