[BUG] Jumbo frames issues after suspend/resume

Question

I have a 2.66Ghz MacBookPro5,1 which I recently upgraded to Snow Leopard. It's connected to a gigabit LAN and makes use of jumbo frames (MTU 9000).
Everything was working flawlessly under Leopard, but since the upgrade to 10.6, I've noticed some very strange networking behavior. Essentially, networking goes AWOL as soon as it tries to transfer big data chunks *after a suspend/resume*. Remote sessions (ssh), file tranfers (ftp/afp) are affected.
AFAICT, small packets work (eg, the output of "uptime" in a ssh session works just fine), but anything "big" (copying a large file over ftp or afp) hangs the connection. It seems that reducing the jumbo frame max size (using "ifconfig en0 mtu <whatever smaller than the previous setting>") temporarily fixes the issue, until the next hang.
This problem only happens after suspend/resume. Upon cold boot, everything works just fine, so I'm suspecting a driver issue.
The only difference between previously "working just fine" situation and the current issue is the upgrade from 10.5 to 10.6. I should mention I'm running in 64bit mode.
HTH
Message was edited by: thibaut

Answer 1

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