> Update: I went ahead and compiled glibc without TLS / NPTL. 
For 64 bit Xen you don't need to worry about TLS/NPTL.
> Also, I realized that I wasn't allocating all my physical 
> memory to Domain0 for these tests, so I was giving Xen a 
> disadvantage. It didn't change much, but those tests have 
> been re-done.
>
> Here's the odd thing: disabling TLS for 64-bit improved 
> native performance by around 10%, but had no effect on Xen.
How did you disable TLS on 64 bit? It's odd that it would have any
effect on native or xen, let alone such a dramatic one. Are you sure
about this test?
> Native Domain0 Penalty
> 64-bit TLS 50.2 65.0 29.5%
> 64-bit no TLS 44.8 65.0 45.1%
> 32-bit TLS 59.6 59.5 -0.2%
> 32-bit no TLS 59.6 60.2 1.0%
It looks like we need to investigate x86_64 networking performance. We
may well not be getting the pipelining that we do in 32bit, though I
can't immediately think why,
Ian 
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