Messages in this thread | | | Subject | Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others) | From | Lee Revell <> | Date | Sat, 28 Aug 2004 22:20:45 -0400 |
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On Sat, 2004-08-28 at 21:19, spaminos-ker@yahoo.com wrote: > --- Lee Revell <rlrevell@joe-job.com> wrote: > > Is this an SMP machine? There were problems with that version of the > > voluntary preemption patches on SMP. The latest version, Q3, should fix > > these. > > > No, it's a single CPU Athlon 1800+, the kernel is compiled in with support for > SMP system, but that should not have any impact. >
It shouldn't, but it can. For example taking a spinlock just disables preemption with a UP kernel, but with an SMP kernel I believe you can actually end up spinning. You would have to have hit a locking bug or race condition for this to happen. Just to be certain, can you reproduce the problem with a UP kernel?
Lee
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