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xen-users
[Xen-users] Re: Windows Disk performance
Ruslan Sivak schrieb:
I've been getting disappointing results on IO reads when using windows
guests. I'm getting usually around 70MB/s reads using hdtune. When
installing James' PV drivers, the speed drops to about 20MB/s.
The host system is getting around 350MB/s reads. I'm wondering if there
is such a significant slowdown, or if my tests are somehow flawed. The
70MB/s persisted throughout my VM testing, whether I was using Xen,
XenSource or VMWare Server.
So my questions are:
a. Is there a bottleneck somewhere which basically caps the windows
disk performance?
b. Is my testing methodology flawed. Is there a better windows tool
that will measure performance? What about Linux tool? I'm currently
using hdparm -t
Russ
Hi Russ,
first of all let's clarify:
- Is this Mb as in "Megabits per second" or MB as in "Megabytes per
second"? You stated both in your original post in the 0.95 driver
thread, so I want to make sure...
- Did you use the same measurement/tools in all 3 scenarios (dom0,
domU/stock, domU/gplpv)? If yes how exactly? (I'm not aware of hdtune
for linux, so you most probably ran something else to get dom0 performance)
I think the answer to #2 will explain the big difference between dom0
and domU performance (taking into account a bit of a general overhead).
When it comes to PV driver's performance this is an interesting topic.
I've seen posts giving the opposite (not exact numbers but direction)
result, so it would be interesting to find out what causes this.
Best regards,
Christian
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