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xen-devel
Re: [Xen-devel] IDE drives
>
> I'm seeing quite slow IDE write performance on Xenolinux-1.2
> Native linux writes at 30MB/s to an ext2 fs, and Xenolinux DOM0 gets
> about 2MB/s (this is not a virtual disk extent). hdparm doesn't work
> under xenolinux, but that is only part of the problem. Native linux
> writes at 6MB/s without any hdparm tuning.
Take a look at the boot messages -- I suspect Xen hasn't got a
proper driver for your IDE chipset and is falling back to PIO.
You could try porting the driver from Linux (which I expect will
be easy), or wait until the new IO stuff is ready.
> The SCSI hosts seem fine. native linux writes to scsi at 36MB/s and
> xen at 28MB/s.
I'm surprised you're seeing such a drop. With our aacraid
PERC3/Di cards we see (MB/s):
xenolinux Write 28.3 Read 46.7
linux Write 29.2 Read 47.2
Are you sure you're using the same part of the disk? It could be
a driver version issue, but I find it surprising you're
seeing such a performance drop.
Cheers,
Ian
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