From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4251DE87.10002@yahoo.com.au> Date: Tue, 05 Apr 2005 10:40:39 +1000 From: Nick Piggin MIME-Version: 1.0 Subject: Re: per_cpu_pagesets degrades MPI performance References: <20050404192827.GA15142@sgi.com> In-Reply-To: <20050404192827.GA15142@sgi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Jack Steiner Cc: akpm@osdl.org, hugh@veritas.com, linux-mm@kvack.org, linux-ia64@vger.kernel.org List-ID: Jack Steiner wrote: [snip nice detective work] > Has anyone else seen this problem? I am considering adding > a config option to allow a site to control the batch size > used for per_cpu_pagesets. Are there other ideas that should > be pursued? > What about using a non power of 2 for the batch? Like 5. If that helps, then we can make a patch to clamp it to a good value. At a guess I'd say a power of 2 +/- 1 might be the way to go. Nick -- SUSE Labs, Novell Inc. -- 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/ . Don't email: aart@kvack.org