Re: [Xen-users] Network performance difference between x86 and x86_64 guest OS

["Henning Sprang" <henning_sprang@xxxxxx>]

On 12/11/06, Chu, Sam <sam.chu@xxxxxxxxx> wrote:
> [...]
> X86_64 network test data: ~4 MB/s (copying a 150 MB file)
>
> X86 network test data: ~6 MB/s (copying the same file)
There can be quite some differences. I did also not think about this
before, but heard a very interesting talk from Harald Welt of the
netfilter team about (high) network performance.

There are a lot of factors going into network performance, and 32 vs.
64 bit makes quite some difference, but on the other side it depends
also a lot on the type of data you transfer and protocols. This means:
depending on your data and protocols, it is really possible that the
bitness make such a big difference. Already on real hardware, and in
also Xen-internals with handling this bitness make a difference.

Unforunately his paper isn't published yet (as the others from the
conference are), maybe it will be available on
http://www.heinlein-support.de/web/secure-linux-administration-conference/slac-downloadupdates/

some day.

(most other papers are in german, but I know his paper was in english!)

Henning

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