Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031381AbXEDQpw (ORCPT ); Fri, 4 May 2007 12:45:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031383AbXEDQpw (ORCPT ); Fri, 4 May 2007 12:45:52 -0400 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:55891 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1031381AbXEDQpv (ORCPT ); Fri, 4 May 2007 12:45:51 -0400 Date: Fri, 4 May 2007 09:45:49 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: l.genoni@oltrelinux.com cc: Daniel J Blueman , Rajib Majumder , Linux Kernel , l.genoni@sns.it Subject: Re: Kernel Scalability In-Reply-To: Message-ID: References: <6278d2220705020843l718b3272k5d6ebf8b827d0806@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1047 Lines: 20 On Wed, 2 May 2007, l.genoni@oltrelinux.com wrote: > 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. It becomes a hardware issue at higher cpu counts. Commodity hardware is not designed to handle these high processor counts thus workarounds like listed above become necessary. Our 512 processor systems have been running with 1024 HZ for a long time. Plus you really need a good filesystem (XFS). - 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/