Date: Wed, 27 Jun 2007 10:12:47 +0200 From: Erik Trulsson <ertr1013@student.uu.se> To: george+freebsd@m5p.com, freebsd-hackers@freebsd.org Subject: Re: Gigabit Ethernet w/Jumbo Frames Message-ID: <20070627081247.GA30818@owl.midgard.homeip.net> In-Reply-To: <20070627061223.GE1221@funkthat.com> References: <200706270033.l5R0Xkf9084990@mail.reprise.com> <20070627061223.GE1221@funkthat.com>
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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. -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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