Re: Locking comment on shrink_caches()

From: Ingo Molnar (
Date: Wed Sep 26 2001 - 12:42:42 EST

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.


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This archive was generated by hypermail 2b29 : Sun Sep 30 2001 - 21:00:46 EST