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Re: [Qemu-devel] Communication between Windows 7 host and Linux guest


From: Gripon Sébastien
Subject: Re: [Qemu-devel] Communication between Windows 7 host and Linux guest
Date: Mon, 6 Jan 2014 10:09:59 +0000

This is the command line:

qemu-system-armw -M versatilepb -kernel ..\BaseQemu\zImage -hda 
..\BaseQemu\rootfs.squashfs -hdb ..\BaseQemu\flash.ext3 -append "root=/dev/sda 
r" -net tap,ifname=TAP,script=no -net nic 

I talked with the developer here and it seems that the bad speed is mainly due 
to latency. We are investigating also on our side because we use a "special" 
environment: in fact, we use VisualGDB to debug from Visual studio into qemu. 
It seems that VisualGDB's ssh client has poor performances but I don't know yet 
where the latency come from.

Sebastien

-----Message d'origine-----
De : Stefan Hajnoczi [mailto:address@hidden 
Envoyé : lundi 6 janvier 2014 03:15
À : Gripon Sébastien
Cc : address@hidden
Objet : Re: [Qemu-devel] Communication between Windows 7 host and Linux guest

On Sun, Dec 22, 2013 at 07:15:18PM +0000, Gripon Sébastien wrote:
> I have the need to communicate efficiently between Windows 7 host and linux 
> guest. I tried first to use an IP socket communication using TAP driver on 
> Windows. Unfortunately, we reach a maximum of 4 Mbits/s where I would need 
> faster communication (more than 10 Mb/s). I don’t know yet if the TAP driver 
> is slow.

That seems very slow, 100 Mbit/s should definitely be achievable.  But I have 
never tried TAP on Windows.

Can you share the QEMU command-line and the benchmark used to measure this 
result?

Stefan

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