Messages in this thread | | | Date | Wed, 15 Feb 2006 09:08:23 -0600 | From | Jack Steiner <> | Subject | Re: [PATCH] ia64: simplify and fix udelay() |
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On Wed, Feb 15, 2006 at 01:08:41AM -0800, Chen, Kenneth W wrote: > hawkes@sgi.com wrote on Tuesday, February 14, 2006 10:40 AM > > a preemption and migration to another CPU during the > > while-loop > > Off topic from the subject line a bit, but related: how many Altix > SN2 customers in the field turn on CONFIG_PREEMPT? Redhat EL4 doesn't > turn on preempt, SuSE SLES9 and SLES10 beta don't turn it on either. > Is there a real benefit of turning that option on for SN2?
AFAICT, no one at SGI uses or plans to use CONFIG_PREEMPT. Most of our customers use kernels from one of the distros & none at this point enables preemption.
The realtime folks here have experimented with CONFIG_PREEMPT but so far have not seen any significant benefit.
Regardless, we should fix udelay() to handle unsync'ed ITCs. It would be nice to have it working.
-- Jack
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