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[Xen-devel] I/O priorities

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Subject: [Xen-devel] I/O priorities
From: Авраменко Андрей <Andrey.Avramenko@xxxxxxxxxxx>
Date: Fri, 9 Mar 2007 10:28:54 +0300
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Thread-topic: I/O priorities

Hi there!

Could you tell me if there available facilities to make priorities to disk i/o for guest domains?

I've make it with the folowing way:

I've started guest domains (xm create). Then I've make "ls -la" and found PIDs of xvd drivers. Then I've make priorities with "ionice" for this PIDs. The benchmarks:

1-st guest with Real Time class and second with idle class.
"dd if=/dev/zero of=/root/file.txt bs=1024 count=10240000"
1-st: 40Mb/sec
2-nd: 20Mb/sec

"hdparm -t /dev/xvda"
1-st: 25Mb/sec
2-ns: 2Mb/sec

Is it a right way to make disk subsystem priorities?

Thank you!

With best regards,
RHCE, Avramenko Andrew
JSC R-Style. Technical support. DIT.

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