Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936262AbXHIFPq (ORCPT ); Thu, 9 Aug 2007 01:15:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753857AbXHIFPg (ORCPT ); Thu, 9 Aug 2007 01:15:36 -0400 Received: from dsl081-033-126.lax1.dsl.speakeasy.net ([64.81.33.126]:56131 "EHLO bifrost.lang.hm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752399AbXHIFPf (ORCPT ); Thu, 9 Aug 2007 01:15:35 -0400 Date: Wed, 8 Aug 2007 22:11:12 -0700 (PDT) From: david@lang.hm X-X-Sender: dlang@asgard.lang.hm To: Ray Lee cc: Ingo Molnar , Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk, netdev@vger.kernel.org Subject: Re: [PATCH 00/23] per device dirty throttling -v8 In-Reply-To: <2c0942db0708040901x7ada0fe2mf71f37ecba51005b@mail.gmail.com> Message-ID: References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <2c0942db0708040901x7ada0fe2mf71f37ecba51005b@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1968 Lines: 60 On Sat, 4 Aug 2007, Ray Lee wrote: > On 8/4/07, david@lang.hm wrote: >> On Sat, 4 Aug 2007, Ingo Molnar wrote: >> > At least on a surface level, your report has some similarities to > http://lkml.org/lkml/2007/5/21/84 . In that message, John Miller > mentions several things he tried without effect: > > < - I increased the max allowed receive buffer through > < proc/sys/net/core/rmem_max and the application calls the right > < syscall. "netstat -su" does not show any "packet receive errors". mercury1:/proc/sys/net/core# cat rmem_* 124928 131071 mercury1:/proc/sys/net/core# netstat -su Udp: 697853177 packets received 10025642 packets to unknown port received. 191726680 packet receive errors 63194 packets sent RcvbufErrors: 191726680 UdpLite: mercury1:/proc/sys/net/core# echo "512000" >rmem_max > < - After getting "kernel: swapper: page allocation failure. > < order:0, mode:0x20", I increased /proc/sys/vm/min_free_kbytes I have not seen any similar errors > < - ixgb.txt in kernel network documentation suggests to increase > < net.core.netdev_max_backlog to 300000. This did not help. mercury1:/proc/sys/net/core# cat netdev_* 300 1000 mercury1:/proc/sys/net/core# echo "300000" >netdev_max_backlog > < - I also had to increase net.core.optmem_max, because the default > < value was too small for 700 multicast groups. I'm not running multicast. > As they're all pretty simple to test, it may be worthwhile to give > them a shot just to rule things out. unfortunantly the load is not high enough right now to see a real difference (it's only doing ~1400 logs/sec) I'll catch it at a higher load point to see if these make any difference. David Lang > Ray > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/