From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 148FD6B01F0 for ; Fri, 14 Oct 2011 09:57:20 -0400 (EDT) Date: Fri, 14 Oct 2011 08:57:16 -0500 (CDT) From: Christoph Lameter Subject: Re: [PATCH] Reduce vm_stat cacheline contention in __vm_enough_memory In-Reply-To: <20111014135055.GA28592@sgi.com> Message-ID: References: <20111012160202.GA18666@sgi.com> <20111012120118.e948f40a.akpm@linux-foundation.org> <20111013152355.GB6966@sgi.com> <20111013135032.7c2c54cd.akpm@linux-foundation.org> <20111013142434.4d05cbdc.akpm@linux-foundation.org> <20111014122506.GB26737@sgi.com> <20111014135055.GA28592@sgi.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Dimitri Sivanich Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mel Gorman On Fri, 14 Oct 2011, Dimitri Sivanich wrote: > Testing on a smaller machine with 46 writer threads in parallel (my original > test used 120). > > Looks as though cache-aligning and padding the end of the vm_stat array > results in a ~150 MB/sec speedup. This is a nice improvement for only 46 > writer threads, though it's not the full ~250 MB/sec speedup I get from > setting OVERCOMMIT_NEVER. Add to this the increase in the deltas for the ZVCs and change the stat interval to 10 sec? -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org