Re: Gigabit Ethernet w/Jumbo Frames

On Tue, Jun 26, 2007 at 11:12:23PM -0700, John-Mark Gurney wrote:
george+freebsd@xxxxxxx wrote this message on Tue, Jun 26, 2007 at 17:33 -0700:
I'm having poor luck trying to use NFS over a gigabit ethernet using
jumbo frames. By all indications, my switch (Netgear GS608) forwards
jumbo frames with no difficulty, but my Realtek 8169-based cards seem

Are you sure? I just tried w/ my GS608 again, and it still doesn't
pass jumbo frames... I specifically bought a second switch, an SMC
8508T so that I could work on jumbo frame support... I took my MBP
to the SMC and verified that I could ping 5k packets w/o fragmentation
between the two (MBP and a FreeBSD-current box w/ an em card) boxes,
and then took my MBP to the Netgear, and the remote box would not see
the large pings...

I just checked Netgear's website, and they do list Jumbo Frame support..
Either I have an old switch and newer ones support it, or they depend
upon that most people can't figure out to make jumbo frames work
reliabily and depend upon people just using 1500 byte frames...


I guess re(4) should not generate watchdog errors even if intermediate
switches drop/fragment jumbo frames.

--
Regards,
Pyun YongHyeon
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