Re: [Linux-ia64] O(1) scheduler K3+ for IA64

[Jesse Barnes <jbarnes@sgi.com>]

Since I posted this message I've tested out the new K3+ patch quite a
bit more.  I haven't been able to get it to hang if the machine boots
(even if I run hackbench 100 several times), but I often see hangs
(esp. on > 16p systems) at boot right after the message 'Total of 30
processors activated (20899.60 BogoMIPS).'

Any ideas?

Thanks,
Jesse

On Fri, Mar 01, 2002 at 03:06:22PM -0800, Jesse Barnes wrote:
> Hey Erich, I've been testing out your latest K3+ patch (along with
> yours and Mike's NUMA scheduler changes) and found that it seems less
> stable than the old version that used locking for the tlb flush stuff.
> I think there's a deadlock somewhere in the new code since
> 2.4.17 + kdb + ia64 + Ingo K3 + old K3+: rock solid
> 2.4.17 + kdb + ia64 + Ingo K3 + new K3+: sometimes hangs at boot,
>   sometimes after a few hackbench processes have run
> 
> I'm in the process of trying to figure out exactly why the hangs
> happen, but I thought I'd let you know since you might be able to find
> out right away.
> 
> Thanks,
> Jesse
> 
> On Thu, Feb 28, 2002 at 07:44:42PM +0100, Erich Focht wrote:
> > Hi,
> > 
> > the latest scheduler from Ingo included in 2.5.6-pre1 includes
> > set_cpus_allowed() function working for all processes. Here is a port to
> > IA64, kernel 2.4.17. Please apply: 
> >   - kdb-v2.1-2.4.17-common-2
> >   - linux-2.4.17-ia64-011226.diff
> >   - kdb-v2.1-2.4.17-ia64-011226-1
> >   - sched-O1-2.4.17-K3.patch  from http://people.redhat.com/mingo/O(1)-scheduler/
> >   - the appended ia64 port with K3+ changes.
> > 
> > There is a small bugfix included (disable interrupts in
> > migration_task) and I changed the way how the migration tasks were
> > distributed across the CPUs. I hope this works for everybody...
> > 
> > Regards,
> > Erich
> 
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