> Can you try running that test on the same machine running a 32bit
> version of Xen. It's possible something weird is happening just on 64
> bit.
file.zip is approximately 100MB. Ran `ab -n 300 -c 1 localhost/file.zip`. 
Disk I/O should not be a factor; I had Apache slurp the file into RAM before 
each test. Table shows time in seconds and the percent penalty for Xen.
 Native Domain0 Penalty
64-bit TLS 50.2 65.0 29.5%
32-bit TLS 59.6 64.8 8.7%
32-bit no TLS 59.6 62.6 5.0%
On 32-bit, disabling TLS is as easy as moving /lib/tls. For 64-bit, it's 
compiled into Debian's glibc package. I can recompile and run that test if 
you think it's worth doing.
Alex
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