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xen-bugs
[Xen-bugs] [Bug 717] hdparm reports much slower cached I/O in dom0/domU
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=717
------- Comment #2 from inakoshi.hiroya@xxxxxxxxxxxxxx 2006-10-24 04:59 -------
In the previous report, the vcpu configuration was:
dom0: #vcpu=1, pinned on pcpu#0
domU: #vcpu=1, any cpu (e.e.
Comparison was not fair. I would report the case where the domU vcpu is pinned
so that a pcpu is dedicated to it. In addition, I added standard deviations
over each 10 runs.
The conclusion was;
1/ considering the efficient buffered I/O ratio and the large standard
deviation of cached I/O throughput, we can say that the performance was almost
ideal in the latest C/S, meaning that cached I/O ratio was similar to buffered
I/O ratio.
2/ There was no significant difference between the results with and without
vcpu-pin. I confirmed this by t-test with 5% significance level.
Results:
Xen : ia64-unstable C/S 11810
Native: rhel4u4
Xen0 : linux-2.6.16.29-xen
XenU : linux-2.6.16.29-xen
o hdparam -tT /dev/sda
Value Format:
mean+/-stdev (normalized by native throughput)
buffered IO: native 93.29+/-0.05
dom0 92.96+/-0.62 (0.99)
domU (without vcpu-pin) 92.74+/-0.92 (0.99)
domU (with vcpu-pin) 91.78+/-2.50 (0.98)
cached IO: native 5959.69+/-1897.60
dom0 5481.48+/- 722.56 (0.91)
domU (without vcpu-pin) 5037.76+/- 597.84 (0.85)
domU (with vcpu-pin) 5788.94+/- 788.11 (0.97)
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