Red Hat Bugzilla – Bug 217574
Netfront is known to have a bug which would cause high-bandwidth transfers to stall.
Last modified: 2007-11-30 17:07:38 EST
Description of problem:
>What version of netback are you running? The one from the 3.0.3 release is
>known to have a bug which would cause high-bandwidth transfers to stall.
>The offending function is netback.c:tx_add_credit(). You should be able to
>take the version from xen-unstable and copy it into whatever version of
>netback.c you are using.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Reported on xen-devel mailing list as "high bandwidth transfers." Useage case
was high-performance GL tunnelling over GLX over tcp.
Thread is at
"domU networking completely freezes, becoming unresponsive to ssh, ping, the
openGL transport, and other services I tried."
Not reproduced internally, but upstream reported symptoms are severe enough to
warrant the fix.
Claims to be fixed by upstream csets 12262 and 12459 from xen-unstable.
The patches look OK to me. BTW, this problem only occurs if credit scheduling
is disabled, which unfortunately is the default.
Kind of taking this one on blind faith since we don't see it internally. QE ack
2.6.18-7.el5 included in 20070125.0.