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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-users] IO performance depends on number of DomU's?
Is it possible to dedicate one of the CPUs to Dom0 exclusively? Yes. Add this to the kernel boot line: dom0_max_vcpus=1 Edit /etc/xen/xend-config.sxp - set â(dom0-cpus 1)â Reboot Dom0 Regards, Rob -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Danilo Godec Sent: 28 April 2009 14:09 To: xen-users@xxxxxxxxxxxxxxxxxxx Subject: [Xen-users] IO performance depends on number of DomU's? Hi, I was monitoring IO performance of my Xen server using 'iostat' on Dom0 and 'bonnie++'. With no DomU's running, I get about 40 MB/s write and 70 MB7s read - which seems OK for a SW RAID5 array with 6 SATA drives... Running only one DomU doesn't change much - running bonnie++ on either Dom0 or DomU shows almost the same result (again monitoring 'iostat' on Dom0). After I start 16 DomU's, the IO performance goes down the drain - I only get 5-6 MB/s running bonnie++ in Dom0 - or any of the DomU's. What's interesting is that 'iostat' on Dom0 also shows only 5-6 MB/s of IO - so it doesn't look like the cumulative IO of all DomU's would saturate the actual IO capability of the hardware... Any ideas? Things to try? Is it possible to dedicate one of the CPUs to Dom0 exclusively? Danilo _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users The SAQ Group Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ SAQ is the trading name of SEMTEC Limited. Registered in England & Wales Company Number: 06481952 http://www.saqnet.co.uk AS29219 SAQ Group Delivers high quality, honestly priced communication and I.T. services to UK Business. Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed Networks : Remote Support. ISPA Member Find us in http://www.thebestof.co.uk/petersfield _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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