Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751436Ab1BZOpR (ORCPT ); Sat, 26 Feb 2011 09:45:17 -0500 Received: from mail-qy0-f181.google.com ([209.85.216.181]:36766 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750939Ab1BZOpP convert rfc822-to-8bit (ORCPT ); Sat, 26 Feb 2011 09:45:15 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Al4q1+WEeTI/8iiZYNQNx4hcjBb7TcV5jmMwsjAz/feeyyGmbVf5IOZ+C2BFakpRsx IEx/XaKKJlbxd8aouJOcRissyR6qvT1D/w07lVgbcivTubEzuMQeK88LidYVVBtKb4uP NqkQ49CtCRb0iL/nwG3t+jGoOuo1+RcTofpSU= MIME-Version: 1.0 In-Reply-To: <20110224121339.GE23042@quack.suse.cz> References: <1295402148.4773.143.camel@debian> <1295402606.1949.871.camel@sli10-conroe> <20110120151656.GC18875@redhat.com> <20110126081529.GA28909@sli10-conroe.sh.intel.com> <1297502512.29573.26.camel@debian> <1297650318.29573.2482.camel@debian> <1297732201.24560.2.camel@sli10-conroe> <20110221164909.GG6584@quack.suse.cz> <1298449487.14712.1064.camel@debian> <20110224121339.GE23042@quack.suse.cz> Date: Sat, 26 Feb 2011 15:45:12 +0100 Message-ID: Subject: Re: [performance bug] kernel building regression on 64 LCPUs machine From: Corrado Zoccolo To: Jan Kara , Jeff Moyer Cc: "Alex,Shi" , "Li, Shaohua" , Vivek Goyal , "tytso@mit.edu" , "jaxboe@fusionio.com" , "linux-kernel@vger.kernel.org" , "Chen, Tim C" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1889 Lines: 42 On Thu, Feb 24, 2011 at 1:13 PM, Jan Kara wrote: > On Wed 23-02-11 16:24:47, Alex,Shi wrote: >> Though these patches can not totally recovered the problem, but they are >> quite helpful with ccache enabled situation. It increase 10% performance >> on 38-rc1 kernel. >  OK and what was the original performance drop with WRITE_SYNC change? > >> I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here: >> with patches: >  I'm attaching patches rebased on top of latest Linus's tree. > Corrado, could you possibly run your fsync-heavy tests so that we see > whether there isn't negative impact of my patches on your fsync-heavy > workload? Thanks. The workload was actually Jeff's, and the stalls that my change tried to mitigate showed up on his enterprise class storage. Adding him so he can test it. Corrado >                                                                Honza > -- > Jan Kara > SUSE Labs, CR > -- __________________________________________________________________________ dott. Corrado Zoccolo                          mailto:czoccolo@gmail.com PhD - Department of Computer Science - University of Pisa, Italy -------------------------------------------------------------------------- The self-confidence of a warrior is not the self-confidence of the average man. The average man seeks certainty in the eyes of the onlooker and calls that self-confidence. The warrior seeks impeccability in his own eyes and calls that humbleness.                                Tales of Power - C. Castaneda -- 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/