From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephan Diestelhorst Subject: Re: Re: IDLE domain is scheduled more than dom0 Date: Sat, 09 Jul 2005 19:17:49 +0100 Message-ID: <42D014CD.9080103@cam.ac.uk> References: <571ACEFD467F7749BC50E0A98C17CDD8073C8586@pdsmsx403> <200507081133.02927.habanero@us.ibm.com> <200507081140.05185.habanero@us.ibm.com> <8ae780250507081206660c495f@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <8ae780250507081206660c495f@mail.gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: bin.ren@cl.cam.ac.uk Cc: Dan Magenheimer , Andrew Theurer , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org >BTW, on my uniprocessor test machine with latest xen-unstable, >xenlinux 2.6.11.12, domU sees significant drop in network throughputs >(~40% less!) I'm interested in whether other people encounter similar >situations, especially on SMP machines. > > > > Mhmhm, this is interesting, what are the timing parameters for your domains? Thanks, Stephan >On 7/8/05, Andrew Theurer wrote: > > >>On Friday 08 July 2005 11:33, Andrew Theurer wrote: >> >> >>>On Friday 08 July 2005 09:53, Dan Magenheimer wrote: >>> >>> >>>>> Shouldn't IDLE domain not be scheduled for most time? Because >>>>>idle task will call into PAL for power save on XEN/IA64, the >>>>>performance is really, really bad to boot Dom0. The net effect is >>>>>about ten times slower. After adding "sched=bvt", everything back >>>>>to normal. >>>>> >>>>> >>>>If the sedf scheduler is scheduling the idle domain when >>>>domain0 is runnable, surely this is affecting performance >>>>on x86 also and is a bug that should be fixed? >>>> >>>>Has anyone done any performance testing (on x86) since >>>>sedf was checked in as the default? >>>> >>>> >>>Just tried launching some cpu bound tasks in dom0, and I get only 75% >>>cpu util for dom0. I'll try the other domain scheduler and see if it >>>clears it up. >>> >>> >>OK, just confirmed bvt works as expected in ia32. >> >>-Andrew >> >>_______________________________________________ >>Xen-devel mailing list >>Xen-devel@lists.xensource.com >>http://lists.xensource.com/xen-devel >> >> >> > >_______________________________________________ >Xen-devel mailing list >Xen-devel@lists.xensource.com >http://lists.xensource.com/xen-devel > >