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From: Stefan Ehmann <shoesoft@gmx.net>
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Date: Tue, 23 Oct 2007 14:28:46 +0200
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Cc: "Aryeh M. Friedman" <aryeh.friedman@gmail.com>
Subject: Re: an interesting observation on network performence
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On Tuesday 23 October 2007 08:36:08 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

- torrent speeds can vary greatly.
- you're using two different clients that probably use different
  algorithms for connection management

You could try utorrent under wine (if that works) or a cross platform client.

Since the guest OS uses the same network stack, I see no network performance 
per se.

-- 
Stefan