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Re: [Xen-devel] [PATCH] Optimizing x86-64 xenlinux using global pagesfor

from [Andrew Theurer]

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To:	Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] Optimizing x86-64 xenlinux using global pagesfor user mode (take 2)
From:	Andrew Theurer <habanero@xxxxxxxxxx>
Date:	Wed, 30 Aug 2006 09:35:23 -0500
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
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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 dom0builder), 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. Iam not sure what is wrong. Should I just testxen-unstable-tip+newest_patch and see where we stand?


-Andrew Theurer


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