Zitat von Jochen Roderburg <[email protected]>:
Situation on two systems (one at home, one at work):
VirtualBox 2.2.0
Linux Host (Slackware-based with self-compiled stock kernel)
Windows 2000 Guest
Bridged networking
Network Chips:
on home system: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI
Express Gigabit Ethernet controller
on work system: Intel Corporation 82566DM-2 Gigabit Network Connection
Everything works fine on both systems with Linux kernel 2.6.28 and
also on the home system with 2.6.29.
But with a 2.6.29 kernel on the work system the direct network
connections between guest and host are extremely slow and not usable.
Examples:
A longer output in a terminal window comes with great pauses and
eventually stalls.
Filesystem connections to a samba server can't display large
directory listings, in the samba log files I see timeout errors and
frequent server restarts.
Astonishingly at the same time connections from the guest to other
remote systems work without problems.
Seems I have to answer this myself. ;-)
In short: it was a bug in the 2.6.29 kernel which is already repaired
in kernel version 2.6.29.2.
More explanations:
I wrote this question both in the vbox forum and here, but did not get
an answer in neither places. But in the forum some other people
reported problems which very much looked like the same and one person
had found the essential clue, namely that it had something to do with
the gso (generic segmentation offload) feature of the Linux kernel.
And with this information it was not difficult to google a redhat
bugzilla entry https://bugzilla.redhat.com/show_bug.cgi?id=490266
where the whole problem was discussed, explained and solved.
It was/is a bug in the linux kernel 2.6.29 which was triggered by the
tun driver (or perhaps the vbox netfilter in our cases) in connection
with nic drivers that use that gso feature.
The (one-line) patch is now in the kernel sources since 2.6.29.2.
So we have various solutions now:
1) A workaround is to turn off the "segmentation offload" feature for
the nic (ethtool -K ethn tso off seems to do the trick).
2) Add the one-line patch to your kernel sources yourself.
3) Use a kernel version from 2.6.29.2 up.
I have tested #2 now on my system and the network connections between
host and guest work fine again.
Jochen Roderburg
RRZK
University of Cologne
Robert-Koch-Str. 10 Tel.: +49-221/478-7024
D-50931 Koeln E-Mail: [email protected]
Germany
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