Re: [Xen-devel] [PATCH] Optimizing x86-64 xenlinux using global pagesfor user mode (take 2)

[Andrew Theurer <habanero@xxxxxxxxxx>]

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.
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?
-Andrew Theurer


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