From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030328AbWD1JLD (ORCPT ); Fri, 28 Apr 2006 05:11:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965205AbWD1JLD (ORCPT ); Fri, 28 Apr 2006 05:11:03 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:52940 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S965201AbWD1JLB (ORCPT ); Fri, 28 Apr 2006 05:11:01 -0400 Date: Fri, 28 Apr 2006 11:10:16 +0200 From: Pavel Machek To: Jens Axboe Cc: linux-kernel@vger.kernel.org, Nick Piggin , Andrew Morton , linux-mm@kvack.org Subject: Re: Lockless page cache test results Message-ID: <20060428091006.GA12001@elf.ucw.cz> References: <20060426135310.GB5083@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060426135310.GB5083@suse.de> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On St 26-04-06 15:53:10, Jens Axboe wrote: > Hi, > > Running a splice benchmark on a 4-way IPF box, I decided to give the > lockless page cache patches from Nick a spin. I've attached the results > as a png, it pretty much speaks for itself. > > The test in question splices a 1GiB file to a pipe and then splices that > to some output. Normally that output would be something interesting, in > this case it's simply /dev/null. So it tests the input side of things > only, which is what I wanted to do here. To get adequate runtime, the > operation is repeated a number of times (120 in this example). The > benchmark does that number of loops with 1, 2, 3, and 4 clients each > pinned to a private CPU. The pinning is mainly done for more stable > results. 35GB/sec, AFAICS? Not sure how significant this benchmark is.. even with 4 clients, you have 2.5GB/sec, and that is better than almost anything you can splice to... Pavel -- Thanks for all the (sleeping) penguins.