From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [rfc][patch] store-free path walking Date: Fri, 9 Oct 2009 10:54:52 +0200 Message-ID: <20091009085451.GS9228@kernel.dk> References: <20091006064919.GB30316@wotan.suse.de> <20091006101414.GM5216@kernel.dk> <20091006122623.GE30316@wotan.suse.de> <20091006124941.GS5216@kernel.dk> <20091007085849.GN30316@wotan.suse.de> <20091008123622.GA30316@wotan.suse.de> <20091008125746.GL9228@kernel.dk> <20091008132200.GB30316@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Linus Torvalds , Linux Kernel Mailing List , linux-fsdevel@vger.kernel.org, Ravikiran G Thirumalai , Peter Zijlstra To: Nick Piggin Return-path: Received: from brick.kernel.dk ([93.163.65.50]:43902 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754153AbZJIIz2 (ORCPT ); Fri, 9 Oct 2009 04:55:28 -0400 Content-Disposition: inline In-Reply-To: <20091008132200.GB30316@wotan.suse.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Thu, Oct 08 2009, Nick Piggin wrote: > This is actualy nice too. My tests were on a 2s8c Barcelona system, > but this is showing we have a nice serial win on Nehalem as well. > Actually K8 CPUs have a bit faster lock primitives than earlier > Intel CPUs I think (closer to Nehalem), so we might see an even > bigger win with a Core2. Ran it on another box. This isn't quite a core 2 though, it's a sparc64 (Niagara 2). It has 64 threads, too, but just 8 cores. 2.6.32-rc3 serial real 0m5.390s user 0m1.340s sys 0m2.970s 2.6.32-rc3 parallel real 0m2.009s user 0m0.900s sys 0m2.490s vfs serial real 0m4.816s user 0m1.250s sys 0m2.270s vfs parallel real 0m1.967s user 0m0.920s sys 0m1.960s So it's a win-win there on that platform too. -- Jens Axboe