Messages in this thread | | | Date | Thu, 19 Oct 2006 19:16:23 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [RFC] sched_tick with interrupts enabled |
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On Wed, 18 Oct 2006 19:19:00 -0700 "Siddha, Suresh B" <suresh.b.siddha@intel.com> wrote:
> On Wed, Oct 18, 2006 at 02:59:07PM -0700, Christoph Lameter wrote: > > load_balancing has the potential of running for some time if f.e. > > sched_domains for a system with 1024 processors have to be balanced. > > We currently do all of that with interrupts disabled. So we may be unable > > to service interrupts for some time. Most of that time is potentially > > spend in rebalance_tick. > > Did you see an issue because of this or just theoretical? >
IIRC, Fujitsu's 64-cpu ia64/SMP system sufferred from this issue *in older kernel*. Now, we avoid it by creating NUMA nodes and dividing scheduler domains.
Situation was...: 5 runnable processes which were pinned to a cpu in a 64cpu system. the system was always rebalanced and seems to be hanged.
-Kame
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