From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx179.postini.com [74.125.245.179]) by kanga.kvack.org (Postfix) with SMTP id 8B4B56B0044 for ; Fri, 2 Nov 2012 15:26:00 -0400 (EDT) Received: by mail-ob0-f169.google.com with SMTP id va7so4798593obc.14 for ; Fri, 02 Nov 2012 12:25:59 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <50937918.7080302@parallels.com> References: <1351771665-11076-1-git-send-email-glommer@parallels.com> <20121101170454.b7713bce.akpm@linux-foundation.org> <50937918.7080302@parallels.com> Date: Sat, 3 Nov 2012 04:25:59 +0900 Message-ID: Subject: Re: [PATCH v6 00/29] kmem controller for memcg. From: JoonSoo Kim Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Glauber Costa Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kamezawa.hiroyu@jp.fujitsu.com, Johannes Weiner , Tejun Heo , Michal Hocko , Christoph Lameter , Pekka Enberg , David Rientjes , Greg Thelen Hello, Glauber. 2012/11/2 Glauber Costa : > On 11/02/2012 04:04 AM, Andrew Morton wrote: >> On Thu, 1 Nov 2012 16:07:16 +0400 >> Glauber Costa wrote: >> >>> Hi, >>> >>> This work introduces the kernel memory controller for memcg. Unlike previous >>> submissions, this includes the whole controller, comprised of slab and stack >>> memory. >> >> I'm in the middle of (re)reading all this. Meanwhile I'll push it all >> out to http://ozlabs.org/~akpm/mmots/ for the crazier testers. >> >> One thing: >> >>> Numbers can be found at https://lkml.org/lkml/2012/9/13/239 >> >> You claim in the above that the fork worload is 'slab intensive". Or >> at least, you seem to - it's a bit fuzzy. >> >> But how slab intensive is it, really? >> >> What is extremely slab intensive is networking. The networking guys >> are very sensitive to slab performance. If this hasn't already been >> done, could you please determine what impact this has upon networking? >> I expect Eric Dumazet, Dave Miller and Tom Herbert could suggest >> testing approaches. >> > > I can test it, but unfortunately I am unlikely to get to prepare a good > environment before Barcelona. > > I know, however, that Greg Thelen was testing netperf in his setup. > Greg, do you have any publishable numbers you could share? Below is my humble opinion. I am worrying about data cache footprint which is possibly caused by this patchset, especially slab implementation. If there are several memcg cgroups, each cgroup has it's own kmem_caches. When each group do slab-intensive job hard, data cache may be overflowed easily, and cache miss rate will be high, therefore this would decrease system performance highly. Is there any result about this? Thanks. -- 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