From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <47B2D6AB.1020408@suse.de> Date: Wed, 13 Feb 2008 12:38:19 +0100 From: Andi Kleen MIME-Version: 1.0 Subject: Re: Fastpath prototype? References: <20080211235607.GA27320@wotan.suse.de> <200802121140.12040.ak@suse.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: Nick Piggin , Andrew Morton , Mel Gorman , linux-mm@kvack.org, Pekka J Enberg List-ID: Christoph Lameter wrote: > Here is a patch to remove the pcp lists (just in case someone wants to toy > around with these things too). It hits tbench/SLUB badly because that > relies heavily on effective caching by the page allocator > > tbench/SLUB: 726.25 MB/sec > > Even adding the fast path prototype (covers only slab allocs >=4K > allocs) yields only 1825.68 MB/sec So why is the new fast path slower than the old one? Because it is not NUMA aware? -Andi -- 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