 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] credit based scheduler
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | Re: [Xen-devel] credit based scheduler |
| From: | "Molle Bestefich" <molle.bestefich@xxxxxxxxx> |
| Date: | Wed, 21 Jun 2006 21:39:17 +0200 |
| Delivery-date: | Wed, 21 Jun 2006 12:39:47 -0700 |
| Domainkey-signature: | a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=MCsuFgotGYBfVjt5f2EKyO8nEQd+Qy8sCmz1h7Y1xRAm12EJ/qyiJUGQRRIn7wGHZsVlGMGbV0I9Ri1fBNfuPz8z0RSMTJsANl/ggkzXx9NGAes6Ymr9iKihFhYPwuTj/pa6S48F87jHAbUSIxi21A8ULG9TDLZJPHJodggtoo8= |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <20060621162818.GA19690@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| List-help: | <mailto:xen-devel-request@lists.xensource.com?subject=help> |
| List-id: | Xen developer discussion <xen-devel.lists.xensource.com> |
| List-post: | <mailto:xen-devel@lists.xensource.com> |
| List-subscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
| List-unsubscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
| References: | <ksrinivasan@xxxxxxxxxx> <44991A88.E57C.0030.0@xxxxxxxxxx> <E1Ft3fM-0002TR-00@xxxxxxxxxxxxxxxxx> <20060621162818.GA19690@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
Emmanuel Ackaouy wrote: The credit scheduler is an SMP CPU scheduler. It is designed such that no physical CPU will ever idle if there is a waiting runnable VCPU on the host. We call this being work conserving. 3 active UP guests on a 2CPU host each get 33% of the total CPU available; The credit scheduler takes care of migrating guest VCPUs across physical CPUs to achieve this transparently. Migrating 1 VCPU across 2 CPUs, or swapping all 3 VCPUs around in a ring-fashion? Sounds like this algorithm is an evil killer of CPU cache performance to me :-). _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: [Xen-devel] Hi,something about the xentrace tool, George Dunlap |
|---|---|
| Next by Date: | [Xen-devel] [PATCH] Virtual SCSI frontend and backend drivers, FUJITA Tomonori |
| Previous by Thread: | Re: [Xen-devel] credit based scheduler, Emmanuel Ackaouy |
| Next by Thread: | Re: [Xen-devel] credit based scheduler, Emmanuel Ackaouy |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
