Messages in this thread |  | | Subject | Re: [CFT][PATCH *] faster cache reclaim | From | Robert Love <> | Date | 09 Oct 2001 19:29:13 -0400 |
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On Mon, 2001-10-08 at 19:38, Rik van Riel wrote:
> This patch is meant to fix the problems where heavy cache > activity flushes out pages from the working set, while still > allowing the cache to put some pressure on the working set.
Running 2.4.10-ac10 + preempt-kernel + eatcache
System with 3 runnable processes and 2 with large working sets. 384MB RAM, 768MB swap. During heavy I/O the resulting cache activity did "stall" the system as badly as without the patch.
I typically notice high system response time at the start of a heavy I/O operation when the used memory is primarily taken by cache (ie after a previous heavy I/O operation). This was an issue for me because I don't expect that sort of high latency with the preemption patch.
For example, starting a `dbench 16' would sometimes cause a brief stall (especially if it is the second run of dbench). It's better now, but still not perfect. The VM holds a lot of locks for a long time.
Good work. I hope Alan sees it soon.
Robert Love
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