Date: Wed, 27 Jun 2007 02:23:28 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: george+freebsd@m5p.com, freebsd-hackers@freebsd.org Subject: Re: Gigabit Ethernet w/Jumbo Frames Message-ID: <20070627092327.GF1221@funkthat.com> In-Reply-To: <20070627081247.GA30818@owl.midgard.homeip.net> References: <200706270033.l5R0Xkf9084990@mail.reprise.com> <20070627061223.GE1221@funkthat.com> <20070627081247.GA30818@owl.midgard.homeip.net>
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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@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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