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From: Michael Fritscher <michael@fritscher.net>
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Date: Thu, 14 Apr 2016 20:54:56 +0200
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Subject: Re: [Qemu-devel] [PATCH for 2.6] wxx: Fix broken TCP networking
 (regression)
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To: Samuel Thibault <samuel.thibault@gnu.org>, Stefan Weil <sw@weilnetz.de>
Cc: QEMU Developer <qemu-devel@nongnu.org>, "Daniel P. Berrange" <berrange@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, Peter Maydell <peter.maydell@linaro.org>

Hello Samuel,


> Michael, what do you mean by "slow", the bandwidth, or the time to
> connect?  Does it help if you disable ipv6?

@Ipv6: I'll test it tomorrow.

I tested with wget http://www.heise.de.
On the guest program point of view, it seems to hang at waiting at the
first patch of data after sending the request. (see the screenshot I
sent you directly).  After starting receiving, it seems as the data were
here instantly (a bit slowed down by the strace, but this was very much
faster than the wait for the beginning of the response).

Another thing: The tcpdump which was running within qemu dropped 30 out
of 83 packets... It was running on a Skylake based Xeon CPU with almost
3 GHz - so I think this shouldn't be a problem^^ I sent you the tcpdumps
directly as well.

I tested it on Windows 7 64 bit.

Best regards,
Michael