From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bin Ren Subject: Re: Xen & I/O in clusters - Single Vs. Dual CPU issue Date: Thu, 4 Nov 2004 18:41:27 +0000 Message-ID: <8ae78025041104104164c4ebf9@mail.gmail.com> References: <20041029183953.GB18329@idi.ntnu.no> <20041102161308.GD18329@idi.ntnu.no> <200411021635.36596.mark.williamson@cl.cam.ac.uk> <200411021651.35419.mark.williamson@cl.cam.ac.uk> Reply-To: br260@cam.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Rune Johan Andresen Cc: Xen Virtual Machine Monitor , H=E5vard_Bjerke , Rune Andresen List-Id: xen-devel@lists.xenproject.org Among A1, A2, B1, B2, which ones are domain 0 and which are unpriviledged? - Bin On Thu, 4 Nov 2004 18:42:34 +0100, Rune Johan Andresen wrote: > Well, after the issue between two xen dom0 domains is solved there is a > new case we don't > understand: > > With two physical domains and 4 guest OSs (2 on each physical node) we > get some rare results with ttcp (b=1000000, l = 1000000): > > Lets say we have two guest OSs on physical node A, A1 and A2, and two > guest OSs on physical node B, B1 and B2. > > Between A1 and B1 I get 110 000 KB/s (which is almost optimal!) > Between A1 and B2 I get 81 0000 KB/s > Between A2 and B1 I get 94 000 KB/s > > Do you have any idea why we get less performance in the last two cases? > It doesn't make sense. It cant be > a bottleneck in the network either because of case 1.(?) > > Cheers, > Rune > > > > > On Nov 2, 2004, at 5:51 PM, Mark A. Williamson wrote: > > >> If you're using MPI over TCP/IP (which I imagine you are) then it > >> should > >> Just Work (TM). We have tried live migration with MPI applications > >> but you > >> shouldn't have any problems moving the VMs around with a cluster. > > > > Sorry I meant to say we have *not* tried live migration with MPI > > applications. > > > > Note to self: read before clicking send! > > > > Cheers, > > Mark > > > > > > ------------------------------------------------------- > > This SF.Net email is sponsored by: > > Sybase ASE Linux Express Edition - download now for FREE > > LinuxWorld Reader's Choice Award Winner for best database on Linux. > > http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xen-devel > > ------------------------------------------------------- > This SF.Net email is sponsored by: > Sybase ASE Linux Express Edition - download now for FREE > LinuxWorld Reader's Choice Award Winner for best database on Linux. > http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xen-devel > ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click