From mboxrd@z Thu Jan 1 00:00:00 1970 From: ANNIE LI Subject: Re: iperf problem with Windows SMP VM Date: Wed, 21 Jan 2009 11:02:21 +0800 Message-ID: <4976903D.2050100@oracle.com> References: <49759F0E.7050404@oracle.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0283895944==" Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: James Harper Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org This is a multi-part message in MIME format. --===============0283895944== Content-Type: multipart/alternative; boundary="------------060203020100070505000104" This is a multi-part message in MIME format. --------------060203020100070505000104 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit James, Thanks a lot. I will have a test on xen3.3.1. Thanks Annie James Harper wrote: >> Hi >> >> I am developing Window pv network driver and hit a problem now. >> >> My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM >> with 1 VCPU on a same server, iperf performance is OK between those >> > two > >> VM, but there is performance degradation between those 2 VM when i >> increase VCPU from 1 to 2. >> This problem occurs in QEMU mode too. >> >> Does Xen 3.1.4 has such problem or anything wrong in my configure >> > file? > > > Annie, > > I think it would be worthwhile testing Xen-3.3.1 as I get comparable > performance on SMP vs UP under 2003 (around 80% I think). > > Under XP, SMP and UP performance are much closer, due to the way > interrupts are handled (according to the guys on the ntdev list). > > James > --------------060203020100070505000104 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit James,

Thanks a lot. I will have a test on xen3.3.1.

Thanks
Annie

James Harper wrote: 
Hi

I am developing Window pv network driver and hit a problem now.

My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM
with 1 VCPU on a same server, iperf performance is OK between those
    
two
  
VM, but there is performance degradation between those 2 VM when i
increase VCPU from 1 to 2.
This problem occurs in QEMU mode too.

Does Xen 3.1.4 has such problem or anything wrong in my configure
    
file?
  

Annie,

I think it would be worthwhile testing Xen-3.3.1 as I get comparable
performance on SMP vs UP under 2003 (around 80% I think).

Under XP, SMP and UP performance are much closer, due to the way
interrupts are handled (according to the guys on the ntdev list).

James
--------------060203020100070505000104-- --===============0283895944== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel --===============0283895944==--