From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: memory performance 20% degradation in DomU -- Sisu Date: Thu, 13 Mar 2014 10:25:45 +0000 Message-ID: <532187A9.1010608@eu.citrix.com> References:

<1394614537.31942.49.camel@Abyss> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1882025262964785400==" Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Sisu Xi , Dario Faggioli Cc: Meng Xu , xen-devel List-Id: xen-devel@lists.xenproject.org --===============1882025262964785400== Content-Type: multipart/alternative; boundary="------------070906090100060509020300" --------------070906090100060509020300 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit On 03/12/2014 04:50 PM, Sisu Xi wrote: > Hi, Dario: > > Thanks for the reply. > > The CPU i am using is i7 X 980 @ 3.33 GHz, > each core has dedicated L1(32K data, 32K inst) and L2 (256K unified) > cache, all 6 cores share a 12MB L3 cache. > I pinned Dom-0 to core 0, and Dom-U to core 1. It might be worth switching those around -- e.g., try pinning domU to core 4 / 5, or try pinning domU to core 0 and dom0 to core1, just to rule out some kind of strange NUMA / microarchitecture effect. -George --------------070906090100060509020300 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit

On 03/12/2014 04:50 PM, Sisu Xi wrote:

Hi, Dario:

Thanks for the reply.

The CPU i am using is i7 X 980 @ 3.33 GHz,

each core has dedicated L1(32K data, 32K inst) and L2 (256K unified) cache, all 6 cores share a 12MB L3 cache.

I pinned Dom-0 to core 0, and Dom-U to core 1.

It might be worth switching those around -- e.g., try pinning domU to core 4 / 5, or try pinning domU to core 0 and dom0 to core1, just to rule out some kind of strange NUMA / microarchitecture effect.

-George

--------------070906090100060509020300-- --===============1882025262964785400== 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.xen.org http://lists.xen.org/xen-devel --===============1882025262964785400==--