Hi there!
I've made some perfomance tests on Fedora Core 6. It seems that there are some troubles with reading from disk through buffers:
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Dom0:
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hdparm -tT /dev/cciss/c0d0
Timing cached reads: 2800Mb in 2.00 seconds = 1400.41 Mb/sec
Timing buffered disk reads: 218 Mb in 3.00 seconds = 72.56 Mb/sec
hdparm -t --direct /dev/cciss/c0d0
Timing O_DIRECT disk reads: 216 Mb in 3.01 seconds = 71.84 Mb/sec
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Guest1:
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hdparm -tT /dev/xvda
Timing cached reads: 2788Mb in 2.00 seconds = 1392.98 Mb/sec
Timing buffered disk reads: 72 Mb in 3.07 seconds = 23.44 Mb/sec
hdparm -t --direct /dev/xvda
Timing O_DIRECT disk reads: 240 Mb in 3.00 seconds = 79.97 Mb/sec
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With best regards,
RHCE, Avramenko Andrew
JSC R-Style. Technical support. DIT.
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