Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766885AbXEBRkJ (ORCPT ); Wed, 2 May 2007 13:40:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1766901AbXEBRkJ (ORCPT ); Wed, 2 May 2007 13:40:09 -0400 Received: from vsmtp14.tin.it ([212.216.176.118]:51826 "EHLO vsmtp14.tin.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1766885AbXEBRkH (ORCPT ); Wed, 2 May 2007 13:40:07 -0400 Date: Wed, 2 May 2007 19:39:48 +0200 (CEST) From: l.genoni@oltrelinux.com X-X-Sender: venom@Phoenix.oltrelinux.com To: Daniel J Blueman cc: Rajib Majumder , Linux Kernel , l.genoni@sns.it Subject: Re: Kernel Scalability In-Reply-To: <6278d2220705020843l718b3272k5d6ebf8b827d0806@mail.gmail.com> Message-ID: References: <6278d2220705020843l718b3272k5d6ebf8b827d0806@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: 1770 Lines: 46 On Wed, 2 May 2007, Daniel J Blueman wrote: > Date: Wed, 2 May 2007 16:43:44 +0100 > From: Daniel J Blueman > To: Rajib Majumder > Cc: Linux Kernel > Subject: Re: Kernel Scalability > Resent-Date: Wed, 02 May 2007 17:44:58 +0200 > Resent-From: > > On 2 May, 14:00, "Rajib Majumder" wrote: >> Hi, >> >> I am wondering if 2.4.x/2.6.x kernel is scalable enough to run on >> 8-CPU hardware. Do we have any scalability comparison data between >> 2.4/2.6 kernels and beyond 4-CPU? >> >> If yes, is the scalablity is near linear? >> >> Any input is appreciated. > > There are 128-processor IA64 systems which run recent 2.6 kernels out > there; the per-processor counters, RCU and page-fault scalability work > has been instrumental to the necessary scaling for decent resource > usage on these. > > IIRC, there were some patches being developed to improve pagecache > scalability lately too, but I guess it all depends on what kind of > workload you have... > To stay on systems probably more familiar to the user who asked this question, there are also some 64 core X86_64 bot AMD and Intel out there, here the 2.6 kernel is doing very well even on those intel CPU with shared L2 cache. I have some 16 and 32 core Opteron and never had scalability problems. You have to pay a lot of attention to your kernel configuration (100 HZ, just BKL preemption), and to the filesystems you decide to use. - 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/