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xen-devel
Re: [Xen-devel] [PATCH] Optimizing x86-64 xenlinux using global pagesfor
Nakajima, Jun wrote:
Andrew Theurer wrote:
Ian Pratt wrote:
The previous patch had a problem with the builder, which constructs
the initial page tables with the USER bit on. And Xen couldn't
distinguish kernel or use pages. It was partially checked avoiding
the bug, and it's finished with this patch.
Thanks. Have you any updated benchmark numbers as the bug could have
been giving quite a performance boost before.
Looks like part of the boost was realized by the bug, but I still see
consistent and visible improvements with lmbench. If I turn on the
global bits for the kernel pages as well, I see more improvements, which
are comparable with or better than before. I think we need to do macro
benchmarks to see how this helps.
FWIW, I had been running more extensive testing on changeset 11225
(before global-bit) and 11229 (global-bit with revert/fix for dom0
builder), and they do not match the initial testing I did with rev
11118 + global_1 patch. In fact, I am not seeing really any
improvement. I am not sure what is wrong. Should I just test
xen-unstable-tip+newest_patch and see where we stand?
Yes, please. You shouldn't have observed any performance difference
between 11225 and 11229 because the changeset 11226 did not enable the
global bit.
OK, then that would explain it :) I'll run tip+ your latest patch.
-Andrew Theurer
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