82 messages in com.xensource.lists.xen-devel[Xen-devel] Re: poor domU VBD perform...
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Peter Bier26 Mar 2005 10:14 
Ian Pratt27 Mar 2005 09:41 
peter bier28 Mar 2005 00:48 
peter bier28 Mar 2005 04:44 
Ian Pratt28 Mar 2005 10:54 
Andrew Theurer28 Mar 2005 11:32 
Ian Pratt28 Mar 2005 12:13 
Andrew Theurer28 Mar 2005 12:17 
Andrew Theurer28 Mar 2005 13:48 
Ian Pratt28 Mar 2005 14:16 
Peter Bier28 Mar 2005 15:38 
Andrew Theurer28 Mar 2005 16:27 
Pasi Kärkkäinen28 Mar 2005 22:19 
Ian Pratt29 Mar 2005 00:13 
peter bier29 Mar 2005 00:43 
peter bier29 Mar 2005 03:39 
Kurt Garloff29 Mar 2005 05:33 
Ian Pratt29 Mar 2005 05:38 
Ian Pratt29 Mar 2005 06:19 
B.G. Bruce29 Mar 2005 06:28 
peter bier29 Mar 2005 07:27 
Andrew Theurer29 Mar 2005 10:39.Other
Steven Hand29 Mar 2005 11:13 
Kurt Garloff29 Mar 2005 14:44.diff
Andrew Theurer29 Mar 2005 14:58 
Kurt Garloff29 Mar 2005 15:19 
Andrew Theurer29 Mar 2005 15:26 
Jens Axboe30 Mar 2005 00:53 
Kurt Garloff30 Mar 2005 02:00 
Ian Pratt30 Mar 2005 03:15 
peter bier30 Mar 2005 09:00 
Andrew Theurer30 Mar 2005 10:04 
Jens Axboe30 Mar 2005 23:04 
Jens Axboe30 Mar 2005 23:10 
Keir Fraser31 Mar 2005 00:17 
Jens Axboe31 Mar 2005 00:18 
Philip R Auld31 Mar 2005 06:32 
Kurt Garloff31 Mar 2005 07:34 
Jens Axboe31 Mar 2005 07:39 
Jens Axboe31 Mar 2005 07:41 
Keir Fraser31 Mar 2005 07:49 
Andrew Theurer31 Mar 2005 08:01 
Nivedita Singhvi31 Mar 2005 08:27 
Philip R Auld31 Mar 2005 08:52 
Philip R Auld31 Mar 2005 08:55 
Jens Axboe31 Mar 2005 09:42 
Jens Axboe31 Mar 2005 09:44 
Ian Pratt31 Mar 2005 09:54 
Jens Axboe31 Mar 2005 10:01 
Jens Axboe31 Mar 2005 10:03 
Kurt Garloff31 Mar 2005 10:27 
Philip R Auld31 Mar 2005 10:42 
Keir Fraser31 Mar 2005 10:57 
Keir Fraser31 Mar 2005 11:07 
Keir Fraser31 Mar 2005 11:10 
Jens Axboe31 Mar 2005 11:19 
Jens Axboe31 Mar 2005 11:21 
Jens Axboe31 Mar 2005 11:21 
Andrew Theurer31 Mar 2005 12:48 
Keir Fraser31 Mar 2005 13:14 
Andrew Theurer31 Mar 2005 13:26 
Ian Pratt31 Mar 2005 13:32 
Nivedita Singhvi31 Mar 2005 13:59 
Andrew Theurer31 Mar 2005 14:13 
Ian Pratt31 Mar 2005 14:36 
Andrew Theurer31 Mar 2005 15:05 
Jens Axboe31 Mar 2005 21:43 
peter bier01 Apr 2005 08:35 
Ian Pratt01 Apr 2005 09:46 
Cédric Schieli01 Apr 2005 13:40 
Ian Pratt01 Apr 2005 15:21 
Cédric Schieli02 Apr 2005 02:36 
Ian Pratt02 Apr 2005 02:56 
Cédric Schieli02 Apr 2005 04:10 
peter bier02 Apr 2005 11:53 
Cédric Schieli03 Apr 2005 08:26 
Ian Pratt03 Apr 2005 09:38 
Cédric Schieli04 Apr 2005 12:13 
Ian Pratt04 Apr 2005 12:36 
Nicholas Lee04 Apr 2005 15:35 
peter bier12 Apr 2005 03:28 
Ian Pratt12 Apr 2005 03:51 
Subject:[Xen-devel] Re: poor domU VBD performance.
From:peter bier (pete@web.de)
Date:03/28/2005 04:44:07 AM
List:com.xensource.lists.xen-devel

Ian Pratt <m+Ian.Pratt <at> cl.cam.ac.uk> writes:

I found out that dom0 does file-system IO and raw IO ( using dd as a tool to test throughput from the disk ) is about exactly the same as when using a standard linux kernel without XEN. But the raw IO from DomU to an unused disk ( a second disk in the system ) is limited to fourty percent of the speed I get within Dom0.

Just to be clear: you're doing a dd performance test within dom0 to the exact same partition on the 2nd disk that you're using when you start the domU and finding that the domU 'dd' performance is 40% of the dom0 performance?

I've not heard of anyone else having problems like this. What happens if you use a partition on the 1st disk?

What chipset is the IDE controller? What device (e.g. sda1) are you exporting the disk partition into the domU as?

Are you sure dom 0 is idle when doing the dd test in the domU?

Ian

Yes I do the performance testing using dd. It's only a simple "benchmark" but its results seem to indicate a fundamental issue. I did the tests with the same partitions from DOM0 just as DomU. I used both disks and Dom0 achieved in all experiments 2.5 times the transfer rate of DomU.

I do not know the chipset of my IDE controller on my computer at home, while I know that in the office it pas a Promise raid controller ( I am neither at home nor in the office momentarily ) . I am sure, that the system was idle during all test ( meaning that there was only the standard system running with no busy jobs and no user program consuming CPU or IO resources.

I am very interested about Xen, but I need to fiy that problem. If there is any "checklist" how to configure XEN efficiently, I might be able to fix the problem myself

Thanks

Peter Bier

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