Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756179Ab2HTJdQ (ORCPT ); Mon, 20 Aug 2012 05:33:16 -0400 Received: from mail-ee0-f46.google.com ([74.125.83.46]:40724 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756057Ab2HTJbF (ORCPT ); Mon, 20 Aug 2012 05:31:05 -0400 Subject: Re: regression with poll(2) From: Eric Dumazet To: Mel Gorman 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 In-Reply-To: <20120820090443.GA3275@suse.de> References: <20120820090443.GA3275@suse.de> Content-Type: text/plain; charset="UTF-8" Date: Mon, 20 Aug 2012 11:30:59 +0200 Message-ID: <1345455059.5158.302.camel@edumazet-glaptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1214 Lines: 40 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 -- 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/