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xen-ia64-devel
Re: [Xen-ia64-devel] [PATCH 0/16] make xenheap configurable unpinning xe
On Mon, 2008-01-07 at 16:52 +0900, Isaku Yamahata wrote:
>
> Presumably benchmarks should be done to confirm that the performance degrade
> is acceptable.
Hi Isaku,
I tried this patchset, but I can't get xenheap_megabytes to work. I
tried 32, 128, 256 and they all hit:
BUG_ON(!is_xenheap_usable_memory(md))
in start_kernel(). Does it work for you? I also ran some kernel build
tests to get an idea of the performance hit. A UP PV domain was less
that 1% over my previous tests and an HVM domains was less that 1/4%
over previous. I may be into the noise of my test results, but it does
seem indicate that there is a small hit. If we can boot more vCPUs and
bigger systems though, it may be a reasonable trade-off. Thanks,
Alex
--
Alex Williamson HP Open Source & Linux Org.
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