From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 16 Jan 2008 14:28:44 -0800 (PST) From: Christoph Lameter Subject: Re: SLUB: Increasing partial pages In-Reply-To: <20080116221618.GB11559@parisc-linux.org> Message-ID: References: <20080116195949.GO18741@parisc-linux.org> <20080116214127.GA11559@parisc-linux.org> <20080116221618.GB11559@parisc-linux.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Matthew Wilcox Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Wed, 16 Jan 2008, Matthew Wilcox wrote: > About 0.1-0.2% 0.3% is considered significant. The results are that stable? A kernel compilation which slightly rearranges cachelines due to code and data changes typically leads to a larger variance on my 8 way box (gets even larger under NUMA). I would expect that the variations on a database load would be more significant. I repeatedly saw patches from Intel to do minor changes to SLAB that increase performance by 0.5% or so (like the recent removal of a BUG_ON for performance reasons). These do not regress again when you build a newer kernel release? -- 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: email@kvack.org