Messages in this thread | | | Date | Wed, 26 Sep 2001 19:42:42 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: Locking comment on shrink_caches() |
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On Tue, 25 Sep 2001, David S. Miller wrote:
> I'm very curious as to what workloads are showing pagecache_lock as > a bottleneck. We haven't noticed this particular bottleneck in most > of the workloads we are running. Is there a good workload that shows > this type of load? > > Again, I defer to Ingo for specifics, but essentially something > like specweb99 where the whole dataset fits in memory.
it was SPECweb99 tests done in 32 GB RAM, 8 CPUs, where the pagecache was nearly 30 GB big. We saw visible pagecache_lock contention on such systems. Due to TUX's use of zerocopy, page lookups happen at a much larger frequency and they are not intermixed with memory copies - in contrast with workloads like dbench.
Ingo
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