Re: [Xen-users] Windows Disk performance

[Ruslan Sivak <russ@xxxxxxxxxx>]

James Harper wrote:
> > 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
> >     
> If you are using the same tool in Windows then I'm comfortable that a
> drop from 70MB/s to 20MB/s indicates a major problem somewhere.
>
> Actually, since I haven't implemented any of the event log stuff yet as
> per my last email, could you run DebugView from sysinternals and see if
> any logging comes up while you run your performance tool? Make sure
> kernel logging is on - you can tell if it is if you go into disk
> management and a whole lot of debug info gets output.
>
> James
>
> _______________________________________________
>   
I will try this on Monday.  Do you know how to turn kernel logging on if 
it's not? 

This thread was actually more about why I'm getting such poor perceived 
performance under the stock drivers.  I understand that there may be 
some issues to work out with the PV drivers, but I wouldn't have 
expected such a huge hit of performance across the board with the stock 
drivers (And across the board I mean, Xen, XenServer and VMWare).  
Should I try testing with something like IOmeter?  I'm really more 
interested in db type performance, so maybe a real benchmarking package 
is necessary.  You know the kind that Tom's Hardware uses to measure 
performance?  Does anyone know of any good ones?
Russ

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users