Gigabit Ethernet w/Jumbo Frames

[Pyun YongHyeon]

On Tue, Jun 26, 2007 at 11:12:23PM -0700, John-Mark Gurney wrote:
 > george+freebsd at m5p.com 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