From mboxrd@z Thu Jan 1 00:00:00 1970 From: Håvard Bjerke Subject: Re: Xen & I/O in clusters - problems! New Information Date: Thu, 28 Oct 2004 13:51:38 +0200 Sender: xen-devel-admin@lists.sourceforge.net Message-ID: <20041028115138.GN23334@idi.ntnu.no> References: <200410271940.27680.mark.williamson@cl.cam.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=unknown-8bit Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <200410271940.27680.mark.williamson@cl.cam.ac.uk> Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: "Mark A. Williamson" Cc: xen-devel@lists.sourceforge.net, Ian Pratt , H?ard Bjerke , Rune Johan Andresen List-Id: xen-devel@lists.xenproject.org We're getting these results in domain 0, not in a VM. As I understand, BV= T or apropos scheduling do not apply in domain 0? H=E5vard On Wed, Oct 27, 2004 at 07:40:27PM +0100, Mark A. Williamson wrote: > Just a thought: you are using the BVT scheduler, right? We haven't tes= ted=20 > performance with the other schedulers recently but we know something go= es=20 > wrong for IO intensive domains on Atropos. >=20 > Mark >=20 > On Wednesday 27 Oct 2004 19:26, Ian Pratt wrote: > > > On Fri, Oct 22, 2004 at 06:47:35PM +0100, Ian Pratt wrote: > > > > > We tried to compile xen0 with CONFIG_E1000_NAPI =3D y and got t= he samre > > > > > results between > > > > > two xen dom0 nodes. I am not sure if these interrupts tells any= thing: > > > > > > > > It's the different rate at which the eth0 interrupt counts go up > > > > during your bandwidth tests that is interesting. e.g. poll it > > > > once a second during the test. > > > > > > We tried sending 1 MB and measured: > > > > 1MB isn't really very much with a 128KB socket buffer. Do you get > > the same results with larger transfers? > > > > > non-SMP native Linux: > > > ~ 130k interrupts > > > 114 kB/s > > > native Linux with compiled-in SMP support, single CPU: > > > ~ 140k interrupts > > > 114 kB/s > > > Xen0: > > > ~ 180k interrupts > > > 80 kB/s > > > > It's pretty odd that Xen's taking more interrupts. Are you using > > the same native kernel version as you are for Xen? > > > > Also, what happens if you boot xen with 'nosmp' on the Xen > > command line. > > > > We've got Xen tcp performance results from a bunch of machines, > > and dom0 to dom0 performance has always been almost identical to > > native for 1500 byte MTU packets. > > > > > > Ian > > > > > > > > ------------------------------------------------------- > > 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=3D5588&alloc_id=3D12065&op=3Dclick > > _______________________________________________ > > 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