Re: [Xen-users] poor harddisk performance HVM domain (Windows 2003 guest)

[Joost van den Broek <joost@xxxxxxxxxxxxx>]

Hi,

I'd like to see some confirmation on this one, since I'm experimenting with 
this for days and being unable to get acceptable transfer speeds. I thought 
such poor performance should not happen with VT? 

It even gets worse when installing and using Ubuntu HVM, can't enable DMA 
for the QEMU harddisk, resulting in a very slow +-3.5MB/s read. Isn't there 
any way to resolve this?

 - Joost

On Thursday 4 May 2006 16:25, Joost van den Broek wrote:
> I am now running into another problem, the networking one has been solved
> (thanks Dave). As I posted to my previous thread, the poor networking
> performance is most probably caused by the harddisk. Running some
> benchmarks gives a max of 10MB/s read throughput, while write activities
> don't go beyond 5MB/s. The guest's write cache on the disk is enabled.
>
> I tried both image and physical disk partition, no difference. The CPU
> and memory benchmarks on the other hand, are close to native. So the
> bottleneck is definitely the (virtual) harddisk.
>
> Dave (and ofcourse others), what is your experience, do you have better
> read/write results?
>
> - Joost
>
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