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Re: [Xen-devel] [PATCH v3] tools/libxc: Batch memory allocations for PV guests



On 06/17/2015 12:14 PM, Ian Campbell wrote:
On Mon, 2015-06-15 at 17:08 +0100, Wei Liu wrote:
On Mon, Jun 15, 2015 at 11:12:07AM +0100, Ross Lagerwall wrote:
The current code for allocating memory for PV guests batches the
hypercalls to allocate memory by allocating 1024*1024 extents of order 0
at a time. To make this faster, first try allocating extents of order 9
(2 MiB) before falling back to the order 0 allocating if the order 9
allocation fails.

On my test machine this reduced the time to start a 128 GiB PV guest by
about 60 seconds.

 From 61s or from 600s?

It reduced the total time _by_ 60 seconds. I think it takes about 10 seconds to start the guest now, but it is not related to the size of guest memory.

Regards
--
Ross Lagerwall

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