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 - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
