From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754906Ab0CQNfI (ORCPT ); Wed, 17 Mar 2010 09:35:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57633 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754863Ab0CQNfG (ORCPT ); Wed, 17 Mar 2010 09:35:06 -0400 Date: Wed, 17 Mar 2010 09:34:07 -0400 From: Vivek Goyal To: Balbir Singh Cc: Andrea Righi , KAMEZAWA Hiroyuki , Daisuke Nishimura , Peter Zijlstra , Trond Myklebust , Suleiman Souhlal , Greg Thelen , "Kirill A. Shutemov" , Andrew Morton , containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH -mmotm 0/5] memcg: per cgroup dirty limit (v7) Message-ID: <20100317133407.GA9198@redhat.com> References: <1268609202-15581-1-git-send-email-arighi@develer.com> <20100315171209.GI21127@redhat.com> <20100315171921.GJ21127@redhat.com> <20100317115427.GR18054@balbir.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100317115427.GR18054@balbir.in.ibm.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 17, 2010 at 05:24:28PM +0530, Balbir Singh wrote: > * Vivek Goyal [2010-03-15 13:19:21]: > > > On Mon, Mar 15, 2010 at 01:12:09PM -0400, Vivek Goyal wrote: > > > On Mon, Mar 15, 2010 at 12:26:37AM +0100, Andrea Righi wrote: > > > > Control the maximum amount of dirty pages a cgroup can have at any given time. > > > > > > > > Per cgroup dirty limit is like fixing the max amount of dirty (hard to reclaim) > > > > page cache used by any cgroup. So, in case of multiple cgroup writers, they > > > > will not be able to consume more than their designated share of dirty pages and > > > > will be forced to perform write-out if they cross that limit. > > > > > > > > > > For me even with this version I see that group with 100M limit is getting > > > much more BW. > > > > > > root cgroup > > > ========== > > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M > > > 4294967296 bytes (4.3 GB) copied, 55.7979 s, 77.0 MB/s > > > > > > real 0m56.209s > > > > > > test1 cgroup with memory limit of 100M > > > ====================================== > > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M > > > 4294967296 bytes (4.3 GB) copied, 20.9252 s, 205 MB/s > > > > > > real 0m21.096s > > > > > > Note, these two jobs are not running in parallel. These are running one > > > after the other. > > > > > > > Ok, here is the strange part. I am seeing similar behavior even without > > your patches applied. > > > > root cgroup > > ========== > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M > > 4294967296 bytes (4.3 GB) copied, 56.098 s, 76.6 MB/s > > > > real 0m56.614s > > > > test1 cgroup with memory limit 100M > > =================================== > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M > > 4294967296 bytes (4.3 GB) copied, 19.8097 s, 217 MB/s > > > > real 0m19.992s > > > > This is strange, did you flish the cache between the two runs? > NOTE: Since the files are same, we reuse page cache from the > other cgroup. Files are different. Note suffix "1". Vivek 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 B5BDF6B007E for ; Wed, 17 Mar 2010 09:34:48 -0400 (EDT) Date: Wed, 17 Mar 2010 09:34:07 -0400 From: Vivek Goyal Subject: Re: [PATCH -mmotm 0/5] memcg: per cgroup dirty limit (v7) Message-ID: <20100317133407.GA9198@redhat.com> References: <1268609202-15581-1-git-send-email-arighi@develer.com> <20100315171209.GI21127@redhat.com> <20100315171921.GJ21127@redhat.com> <20100317115427.GR18054@balbir.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100317115427.GR18054@balbir.in.ibm.com> Sender: owner-linux-mm@kvack.org To: Balbir Singh Cc: Andrea Righi , KAMEZAWA Hiroyuki , Daisuke Nishimura , Peter Zijlstra , Trond Myklebust , Suleiman Souhlal , Greg Thelen , "Kirill A. Shutemov" , Andrew Morton , containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, Mar 17, 2010 at 05:24:28PM +0530, Balbir Singh wrote: > * Vivek Goyal [2010-03-15 13:19:21]: > > > On Mon, Mar 15, 2010 at 01:12:09PM -0400, Vivek Goyal wrote: > > > On Mon, Mar 15, 2010 at 12:26:37AM +0100, Andrea Righi wrote: > > > > Control the maximum amount of dirty pages a cgroup can have at any given time. > > > > > > > > Per cgroup dirty limit is like fixing the max amount of dirty (hard to reclaim) > > > > page cache used by any cgroup. So, in case of multiple cgroup writers, they > > > > will not be able to consume more than their designated share of dirty pages and > > > > will be forced to perform write-out if they cross that limit. > > > > > > > > > > For me even with this version I see that group with 100M limit is getting > > > much more BW. > > > > > > root cgroup > > > ========== > > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M > > > 4294967296 bytes (4.3 GB) copied, 55.7979 s, 77.0 MB/s > > > > > > real 0m56.209s > > > > > > test1 cgroup with memory limit of 100M > > > ====================================== > > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M > > > 4294967296 bytes (4.3 GB) copied, 20.9252 s, 205 MB/s > > > > > > real 0m21.096s > > > > > > Note, these two jobs are not running in parallel. These are running one > > > after the other. > > > > > > > Ok, here is the strange part. I am seeing similar behavior even without > > your patches applied. > > > > root cgroup > > ========== > > #time dd if=/dev/zero of=/root/zerofile bs=4K count=1M > > 4294967296 bytes (4.3 GB) copied, 56.098 s, 76.6 MB/s > > > > real 0m56.614s > > > > test1 cgroup with memory limit 100M > > =================================== > > # time dd if=/dev/zero of=/root/zerofile1 bs=4K count=1M > > 4294967296 bytes (4.3 GB) copied, 19.8097 s, 217 MB/s > > > > real 0m19.992s > > > > This is strange, did you flish the cache between the two runs? > NOTE: Since the files are same, we reuse page cache from the > other cgroup. Files are different. Note suffix "1". Vivek -- 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