From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yuehai Xu <yuehaixu@gmail.com>
Subject: Re: Question about the ability of credit scheduler to
	handle I/O and CPU intensive VMs
Date: Tue, 12 Oct 2010 08:42:20 -0400
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To: George Dunlap <George.Dunlap@eu.citrix.com>
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Sorry for making noise, the mode is PV. Because my scheduler is set to
CPU fairness only, so the number I calculated is almost the same, as
long as I set it to I/O favor, the number is different.

Here is another question, since we always say a short period of time,
how long it should be? 500us? 50us? 1ms? is there any hint that I can
follow?

Thanks,
Yuehai


>
> Remind me, are you running in HVM mode, or PV mode?
>
> That sounds unusual. =A0Is it the number of events delivered, or the
> number of times the guest woke up? =A0NB they're not the same -- an HVM
> guest will block and then wake up on the completion of an I/O
> instruction which is handled by qemu.
>
> If you're running in HVM mode, you can use "xenalyze -s" will give you
> a summary of the trace. =A0In the summary you can see not only now many
> times a VM woke up, but which interrupt was delivered how many times.
>
> At the moment, from Xen's perspective, an event delivery is an event
> delivery. =A0You'd have to manually add some way of classifying an event
> as "I/O".
>
> =A0-George
>