[Xen-users] GPLPV drivers block when copying huge files

[Moritz MÃhlenhoff <muehlenhoff@xxxxxxxxxxxxx>]

Hi,
I hope this is the correct place to report problems with the GPLPV drivers:

The Xen setup is the following:
- Dom0: A 2.6.18-based Xen kernel (from Debian Etch) and Xen 3.2.0 
(3.2.0-3~bpo4+2 to be precise)
- DomU: GPLPV drivers 0.9.11-pre18 and  Windows 2003 (32 bits)

The performance with GPLPV is quite good (the speedup in network speed is 
almost ten times), but there are problems when copying huge files over the 
network using Windows Explorer:
After about 40% some packets get lost (as tested by having a continuous ping 
on the virtualised host) for some seconds and Windows aborts copying the 
file. /var/log/xen/xend.log contains an error message, which correlates to 
the time of connection tear down:

ERROR (__init__:1072) Internal error handling  system.methodSignature: Invalid 
result signatures not supported

Operation with smaller files is reliable.

The initial setup was based on a DRBD file system, but the error could be 
reproduced on plain file storage as well. Likewise, it could be ruled out 
that the problem is SMP-specific, since it could be reproduced with a single 
processor system as well.

When booting without GPLPV driver support the problems disappears.
Is this a known problem? What further information could be collected to 
pinpoint the problem?

Cheers,
Moritz
-- 
Moritz MÃhlenhoff muehlenhoff@xxxxxxxxxxxxx     fon: +49 421 22 232- 0
Development        Linux for Your Business       fax: +49 421 22 232-99
Univention GmbH    http://www.univention.de/   mobil: +49 175 22 999 23

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