From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: regression with poll(2) Date: Mon, 20 Aug 2012 16:20:46 -0700 Message-ID: <20120820162046.f827f758.akpm@linux-foundation.org> References: <20120820090443.GA3275@suse.de> <1345455059.5158.302.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Mel Gorman , 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, torvalds@linux-foundation.org To: Eric Dumazet Return-path: In-Reply-To: <1345455059.5158.302.camel@edumazet-glaptop> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Mon, 20 Aug 2012 11:30:59 +0200 Eric Dumazet wrote: > 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 "seem to help"? Was previous performance fully restored?