From mboxrd@z Thu Jan 1 00:00:00 1970 From: JR Subject: Re: Poor performance with virtio network driver on windows 2008 R2 on KVM Date: Thu, 15 May 2014 13:59:15 -0400 Message-ID: <53750073.7090806@gmail.com> References: <53738DB5.2050006@gmail.com> <5CC583AB71FC0C44A5CAB54823E83A84064D4D2E@SINPEX01CL01.citrite.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: Venkateswara Rao Nandigam , "kvm@vger.kernel.org" Return-path: Received: from mail-ie0-f181.google.com ([209.85.223.181]:59959 "EHLO mail-ie0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755488AbaEOR7R (ORCPT ); Thu, 15 May 2014 13:59:17 -0400 Received: by mail-ie0-f181.google.com with SMTP id rl12so1379533iec.40 for ; Thu, 15 May 2014 10:59:16 -0700 (PDT) In-Reply-To: <5CC583AB71FC0C44A5CAB54823E83A84064D4D2E@SINPEX01CL01.citrite.net> Sender: kvm-owner@vger.kernel.org List-ID: We have tried TSO offload; no effect. I'm thinking about passthough; I don't think that grizzly (openstack, the environment in which I'm running) supports it. Not to say that there's not a way to make it work but ... Thanks JR On 5/15/2014 12:49 AM, Venkateswara Rao Nandigam wrote: > Try TSO offload on Guest Virtio interface > > And try passthrough interface mode at Host Level for this Guest Virtio Interface > > Thanks, > Venkatesh > > -----Original Message----- > From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On Behalf Of JR > Sent: Wednesday, May 14, 2014 9:07 PM > To: kvm@vger.kernel.org > Subject: Poor performance with virtio network driver on windows 2008 R2 on KVM > > Greetings all, > > Though I don't believe that this is KVM problem per se, I'm seeing very poor network performance when using windows 2008R2 KVM instances with the virtio driver when on a 10G network. iperf results show linux VMs getting close to wire speeds, while windows only does about 1.3Gb/sec. > > I've tried a number of tcp settings (chimney, etc...) as recommended by some google searches but nothing has helped. > > Does anyone have any advice? > > Thanks much, > JR > > > -- > Your electronic communications are being monitored; strong encryption is an answer. My public key > -- > 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 > -- Your electronic communications are being monitored; strong encryption is an answer. My public key