an interesting observation on network performence

[Tom Evans]

On Tue, 2007-10-23 at 02:36 -0400, Aryeh M. Friedman wrote:
> I get better network performance on XP running under qemu on 8-current.
> (sorry don't have hard numbers but it roughly times better on p2p
> apps).   Here is the config:
> 
> Host OS:
> 
> 8-current
> amd64
> 4gb ram
> 
> bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>         ether 62:4e:c7:60:d0:a0
>         id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
>         maxage 20 holdcnt 6 proto rstp maxaddr 100 timeout 1200
>         root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
>         member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>         member: re0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
> tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
> 0 mtu 1500
>         ether 00:bd:43:f2:02:00
>         inet6 fe80::2bd:43ff:fef2:200%tap0 prefixlen 64 scopeid 0x5
>         Opened by PID 14839
> 
> sudo qemu -net nic -net tap -hda test -localtime -m 1024 -soundhw all
> 
> Host p2p program: deluge (latest)
> 
> Guest OS:
> 
> XP Pro SP2 (all updates as of 1/1/2007)
> 
> Guest p2p program: uTorrent 1.7

All you are testing is the efficacy of two different programs. You
cannot draw any conclusions about the network stack from this test,
since you are testing one network stack vs the same network stack + a
tiny overhead. 

Tom

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