Re: [Xen-users] Block IO Questions

[G.Bakalarski@xxxxxxxxxx]

Hi


Did you try other (i.e. non-Debian kernel).

I'd suggest e.g. SLES 11 SP2 or even alpine linux ... And see if this
helps ...

We had problems with Block IO (unstable troughput) ) Xen'ed  Debian
kernels (Squeeze or Wheezy, 2.6.32 or 3.2) ... Just krenels ...

GB
> I have to say I've got similar strange behavior since I upgraded my home
> grown storage server (Intel DQ35JO, disks attached to Q35, Core2 E6550,
> 40+ Mbps write) with brand new hardware (ASUS P8H77M-Pro, disks attached
> to H77, Pentium G840, ok not that brand new). I didn't get much more
> than your 10 Mbps.
> System is a 3.2(.15) based Debian squeeze+backports for Dom0 and 3.2
> based Debian testing+sid for DomU.
>
> I improved the situation somwhat by setting xen-blkback's reqs parameter
> to 512 (default is 64 but I don't fully understand what this actually
> sets. There is a tempting comment in xen-blkback.c ;-) ).
>
> I still don't get more then 40-50 Mbps in a linux PV vm (bonnie++, xfs)
> the same Filesystem on md RAID5+lvm does 150 Mbps write 300 Mbps read
> mounted in Dom0.
>
> By the way I can't find any means by which a Dom0 can inform a vm of a
> physical block size other than 512 (like 4k for example), but perhaps
> that's irrelevant here.
>
> Best regards
> Omar Siam
>
>
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>



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