From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dor Laor Subject: Re: RHEL 4.5 guest virtual network performace Date: Mon, 16 Aug 2010 22:49:25 +0300 Message-ID: <4C699645.70209@redhat.com> References: Reply-To: dlaor@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Alex Rixhardson Return-path: Received: from mx1.redhat.com ([209.132.183.28]:38095 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755621Ab0HPTtc (ORCPT ); Mon, 16 Aug 2010 15:49:32 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: > Hi guys, > > I have the following configuration: > > 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box > with RHEL 5.5) > 2. two guests: > 2a: RHEL 5.5, 32bit, > 2b: RHEL 4.5, 64bit > > If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the > virtual network subnet I get great results (> 4Gbit/sec). But if I run > iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad > network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification > > The configuration was made thru virtual-manager utility, nothing > special. I just added virtual network device to both guests. > > Could you guys give me some tips on what should I check? > > Regards, > Alex > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html