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RE: [Xen-ia64-devel] [PATCH] [Resend]Enable hash vtlb
On Mon, 2006-04-10 at 09:09 +0800, Xu, Anthony wrote:
> Hi Alex,
> Sorry for not clear.
> You need to apply three patches I sent before applying this one.
> They are,
> 1. get_pfn_list workaround.
> 2. warning fix
> 3. access reflect fix
> I attach these three patches.
Thanks, I applied all the patches to my test tree and am able to
boot. However, I'm not able to reproduce the performance increase for
domU. I see a performance decrease across the board (including a
significant increase in system time). Here are my results:
10GB RAM (7GB available to xen using max_addr=10G)
(results below are the best time from 2 runs)
bare metal (UP):
1829s (56.6s system) baseline
dom0 w/o hash vtlb:
1928s (64.4s system) +5.4% (+13.7% system)
domU w/o hash vtlb
1877s (63.8s system) +2.6% (+12.7% system)
dom0 w/ hash vtlb
1986s (86.3s system) +8.6% (+52.5% system)
domU w/ hash vtlb
1932s (84.2s system) +5.6% (+48.8% system)
Is the performance increase reproducible on your system? Can you
provide the system specs? Can anyone else verify performance with and
without this patch set on their system? Thanks,
Alex Williamson HP Linux & Open Source Lab
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