[Xen-bugs] [Bug 717] hdparm reports much slower cached I/O in dom0/domU than on native OS

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=717


inakoshi.hiroya@xxxxxxxxxxxxxx changed:

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                 CC|                            |inakoshi.hiroya@xxxxxxxxxxxx
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------- Comment #1 from inakoshi.hiroya@xxxxxxxxxxxxxx  2006-10-22 21:36 -------
Our result was below.  Cached IO degradation was improved in some degree.  But
I am not so sure if we can say that the original degradation problem has been
solved.

Xen   : ia64-unstable C/S 11810
Native: rhel4u4
Xen0  : linux-2.6.16.29-xen
XenU  : linux-2.6.16.29-xen

o hdparm -tT /dev/sda2
    buffered IO: native 93.297  MB/s
                 dom0   92.969  (0.99)
                 domU   92.743  (0.99)

    cached IO: native   5959.69 MB/s
                 dom0  5481.489 (0.92)
                 domU  5037.761 (0.85)

The values are averaged over 10 times trials.


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