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Re: [Xen-devel] pv_ops (2.6.31) and CONFIG_NO_HZ
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] pv_ops (2.6.31) and CONFIG_NO_HZ |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 03 Nov 2009 07:41:07 +0000 |
| Cc: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Delivery-date: | Mon, 02 Nov 2009 23:41:37 -0800 |
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| Thread-topic: | [Xen-devel] pv_ops (2.6.31) and CONFIG_NO_HZ |
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On 02/11/2009 22:29, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: > But as long as we are on the PV topic: Does this mean that > a PV guest that is idle will never get scheduled due to > needing to process a tick? I do see that an idle > PV domain is doing about 250 kernel rdtsc/second, so > is this just because the Xen scheduler has nothing > better to do with a pcpu so it schedules an "idle" > vcpu on it? A PV guest is supposed to set a one-shot timer on the next event in its timer queues. So it depends what sorts of events get put on its timer queues -- if there are periodic events, it will still request seemingly periodic one-shot wakeups. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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