[Xen-users] Poor hard disk performance on xen-3/dom0

["Woon Wai Keen @ doubleukay.com" <doubleukay@xxxxxxxxxxxxxx>]

On a vanilla 2.6.12 kernel, I get:

  60MB/s for hdparm -t /dev/sd[a|b] (on an Intel ICH7 SATA controller).
  30MB/s for hdparm -t /dev/hda (Intel ICH7)

While on the xen dom0 kernel, I get 20MB/s for all three devices. I 
confirm that DMA is enabled for the PATA hard disk. I don't know how to 
check that for the SATA hard disks, but I assume that they're on DMA 
mode too.
Xen is compiled with the following:

xen_changeset          : Fri Dec  9 11:05:06 2005 +0000 8311:53cff3f88e45
cc_compiler            : gcc version 3.3.5 (Debian 1:3.3.5-13)

The dom0 kernel is compiled with almost the same options as the vanilla 
kernel, barring the xen-exclusive and nonxen-exclusive options.
Does anyone else face similar problems?

--
Regards,
wK (www.doubleukay.com)

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