Re: Gigabit Ethernet w/Jumbo Frames
- From: John-Mark Gurney <gurney_j@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 27 Jun 2007 02:23:28 -0700
Erik Trulsson wrote this message on Wed, Jun 27, 2007 at 10:12 +0200:
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...
There are (at least) two different versions of the Netgear GS608 (and some
other Netgear switches.) The older ones do not support Jumbo Frames, while
the newer ones are supposed to do it. See
http://kbserver.netgear.com/inquira/default.asp?ui_mode=answer&prior_transaction_id=5016326&action_code=5&highlight_info=16778279,200,201&turl=http%3A%2F%2Fkbserver.netgear.com%2Fkb_web_files%2Fn101624.asp&answer_id=6141591#__highlight
for some more information on the different versions of some Netgear
switches.
My serial number isn't listed there... It starts w/ GS21146, but it's
around 2 years old so it's probably v1... Thanks for the link.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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