From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [CFT][PATCH *] faster cache reclaim From: Robert Love In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: 09 Oct 2001 19:29:13 -0400 Message-Id: <1002670160.862.15.camel@phantasy> Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: linux-mm@kvack.org, kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/