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Re: [Xen-devel] slow live magration / xc_restore on xen4 pvops
| To: | Brendan Cully <Brendan@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] slow live magration / xc_restore on xen4 pvops |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 3 Jun 2010 06:47:52 +0100 |
| Cc: | Andreas Olsowski <andreas.olsowski@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx> |
| Delivery-date: | Wed, 02 Jun 2010 22:48:46 -0700 |
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| In-reply-to: | <20100603010418.GB2028@xxxxxxxxxxxxxxxxx> |
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| Thread-index: | AcsCuLW7RtO0aOv9RgmjlDI3bwhDzgAJ5iWa |
| Thread-topic: | [Xen-devel] slow live magration / xc_restore on xen4 pvops |
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On 03/06/2010 02:04, "Brendan Cully" <Brendan@xxxxxxxxx> wrote: > I've done a bit of profiling of the restore code and observed the > slowness here too. It looks to me like it's probably related to > superpage changes. The big hit appears to be at the front of the > restore process during calls to allocate_mfn_list, under the > normal_page case. It looks like we're calling > xc_domain_memory_populate_physmap once per page here, instead of > batching the allocation? I haven't had time to investigate further > today, but I think this is the culprit. Ccing Edwin Zhai. He wrote the superpage logic for domain restore. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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