From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: regression with poll(2) Date: Mon, 20 Aug 2012 11:30:59 +0200 Message-ID: <1345455059.5158.302.camel@edumazet-glaptop> References: <20120820090443.GA3275@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Sage Weil , davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, neilb@suse.de, a.p.zijlstra@chello.nl, michaelc@cs.wisc.edu, emunson@mgebm.net, sebastian@breakpoint.cc, cl@linux.com, akpm@linux-foundation.org, torvalds@linux-foundation.org To: Mel Gorman Return-path: In-Reply-To: <20120820090443.GA3275@suse.de> Sender: ceph-devel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Mon, 2012-08-20 at 10:04 +0100, Mel Gorman wrote: > Can the following patch be tested please? It is reported to fix an fio > regression that may be similar to what you are experiencing but has not > been picked up yet. > > - This seems to help here. Boot your machine with "mem=768M" or a bit less depending on your setup, and try a netperf. -> before patch : # netperf MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 14.00 6.05 -> after patch : Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 18509.73