Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753533Ab1FHDXk (ORCPT ); Tue, 7 Jun 2011 23:23:40 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:59962 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751688Ab1FHDXj (ORCPT ); Tue, 7 Jun 2011 23:23:39 -0400 Message-ID: <4DEEEBB6.5090805@cn.fujitsu.com> Date: Wed, 08 Jun 2011 11:25:42 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Thunderbird/3.1.9 MIME-Version: 1.0 To: Takuya Yoshikawa CC: Avi Kivity , Marcelo Tosatti , LKML , KVM Subject: Re: [PATCH 0/15] KVM: optimize for MMIO handled References: <4DEE205E.8000601@cn.fujitsu.com> <20110608121128.2caecdb3.yoshikawa.takuya@oss.ntt.co.jp> In-Reply-To: <20110608121128.2caecdb3.yoshikawa.takuya@oss.ntt.co.jp> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-06-08 11:23:25, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-06-08 11:23:27, Serialize complete at 2011-06-08 11:23:27 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1312 Lines: 46 On 06/08/2011 11:11 AM, Takuya Yoshikawa wrote: > On Tue, 07 Jun 2011 20:58:06 +0800 > Xiao Guangrong wrote: > >> The performance test result: >> >> Netperf (TCP_RR): >> =========================== >> ept is enabled: >> >> Before After >> 1st 709.58 734.60 >> 2nd 715.40 723.75 >> 3rd 713.45 724.22 >> >> ept=0 bypass_guest_pf=0: >> >> Before After >> 1st 706.10 709.63 >> 2nd 709.38 715.80 >> 3rd 695.90 710.70 >> > > In what condition, does TCP_RR perform so bad? > > On 1Gbps network, directly connecting two Intel servers, > I got 20 times better result before. > > Even when I used a KVM guest as the netperf client, > I got more than 10 times better result. > Um, which case did you test? ept = 1 or ept=0 bypass_guest_pf=0 or both? > Could you tell me a bit more details of your test? > Sure, KVM guest is the client, and it uses e1000 NIC, and uses NAT network connect to the netperf server, the bandwidth of our network is 100M. -- 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/