Gigabit Ethernet w/Jumbo Frames
John-Mark Gurney
gurney_j at resnet.uoregon.edu
Wed Jun 27 09:23:29 UTC 2007
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 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...
>
> 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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