Re: [Xen-users] Re: xen 2.0.7 on SuSE 9.3 very slow responses in dom0

[Joost Roeleveld <joost@xxxxxxxxxxxxxxx>]

On Jan 03, 2006 02:56 PM, Dirk Estreng <dirk.estreng@xxxxxx> wrote:

>Tracked it down a little more:
>

<snipped analysis>

>
>So as far as i understand my ATA drive locks up my CPU...
>Where is the problem??
>
>I am running:
>xen2.0.7 on suse 9.3 with 2.6.11.4-21.8-xen

Hi Dirk,

I'm not yet familiar with Xen, subscribed to the list to get some
pointers while waiting for the new computer to arrive.
I have seen a similar problem with a 'normal' linux install though.
Do you have DMA enabled?
Use hdparm to check this, not sure which flags to use, can't check at
the moment.

Without DMA, the performance of harddrives are really bad and can cause
very high CPU utilisation.

If you can't enable DMA (using hdparm), you will need to load the
correct IDE-driver for your system, lspci should be able to tell you
which chipset you are using and then you need to configure the correct
IDE driver into the kernel.
You might need to disable the generic driver to avoid it claiming the
device before the proper driver gets to it.

Hope this helps.

Kind regards,

Joost


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