Re: [Xen-users] performance of pv drivers for windows

[Alexander Piavlo <piavka@xxxxxxxxxxxx>]

Sebastian Reitenbach wrote:
> >  1.5MB/s for random write access is not lousy , if you perform random
> > write test in dom0 or on native non xen kernel
> > you'll also get  1.5MB/s
> >     
> Hm, ok, but without any PV drivers, I got about 7MB/sec. at least for writing 
> to the disk.
>   
This does not look realistic, especially since with random read you got 
only 1.6MB/sec. Maybe this is some QEMU caching issue. Also the graph 
shows 2  strange large time slots with zero write activity.
Would you mind running tiobench benchmark 
http://tiobench.sourceforge.net/ inside dom0 with:
         tiotest -t 4 -f 1024 -r 5000 -b 4096 -d /test
where /test is a mountpoint of a newly created ext3 filesystem large 
enough to hold 1024*4 MB
or better yet:
        tiotest -t THREADS -f SIZE -r 5000 -b 4096 -d /test
where THREADS*SIZE > 2*(Available RAM)

Thanks
Alex

> Therefore I was wondering.
> https://www.l00-bugdead-prods.de/XenBench/random_write_without_pv_driver.htm
>
>   

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