RE: [Xen-ia64-devel] [PATCH] Add support to physdev_ops

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Alex Williamson [mailto:alex.williamson@xxxxxx]
>Sent: 2006年4月21日 10:51
>
>On Thu, 2006-04-20 at 17:01 +0800, Tian, Kevin wrote:
>
>> 2. This patch has no obvious performance influence (Why
>> I say 'obvious' is because latest p2m tree seems not very
>> stable even without this patch. The output drifts with -10-+10%
>> range... It's also possible due to my test environment. )
>
>Hi Kevin,
>
>   I ran some performance tests from xen-ia64-unstable on this patch
>today and also didn't see any obvious performance difference.  My
>results for wget for network and bonnie++ for disk were very consistent
>between runs though.  It's nice to see that iosapic virtualization
>appears to have such minimal overhead.  Thanks,
>
>       Alex
>

Hi, Alex,
        Thanks for test with the patch. It's good to see your data always 
consistent, and that proves my environment really a bit messed. 

        Currently the minimal overhead is because dom0 has seldom 
access to RTE entries at run-time. Later when EOI is also virtualized, 
the overhead may increase. Just guess, and we can see exact 
influence later when final part is ready.

        I'll resend the patch with Isaku's comment.

Thanks,
Kevin

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