Re: [Xen-ia64-devel] [PATCH 0/16] make xenheap configurable unpinning xenheap

[Alex Williamson <alex.williamson@xxxxxx>]

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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