Date: Wed, 18 Aug 1999 20:49:54 -0600 (MDT) From: "Kenneth D. Merry" <ken@kdm.org> To: wes@softweyr.com (Wes Peters) Cc: wpaul@skynet.ctr.columbia.edu (Bill Paul), crandall@matchlogic.com (Charles Randall), dmiller@search.sparks.net, freebsd-hackers@FreeBSD.ORG Subject: Re: Gigabit ethernet support? Message-ID: <199908190249.UAA24348@panzer.kdm.org> In-Reply-To: <37BB5DCB.4847C0BE@softweyr.com> from Wes Peters at "Aug 18, 1999 07:28:43 pm"
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Wes Peters wrote... > Bill Paul wrote: > > > > Of all the gin joints in all the towns in all the world, Charles Randall > > had to walk into mine and say: > > > > > Bill Paul has developed a driver for the Alteon Tigon 1 and 2 cards. > > > > > > http://www.freebsd.org/~wpaul/Alteon/ > > > > > > FYI, > > > Charles > > > > > > -----Original Message----- > > > From: David Miller [mailto:dmiller@search.sparks.net] > > > Sent: Wednesday, August 18, 1999 1:55 PM > > > To: freebsd-hackers@freebsd.org > > > Subject: Gigabit ethernet support? > > > > > > > > > Any supported cards in 3.2.x? The HCL pages don't list any:( > > > > The ti driver supports several cards, including the Alteon AceNIC, > > the 3Com 3c985-SX, the Netgear GA620, the DEC EtherWORKS 1000, the > > SGI PCI gigabit ethernet card, the NEC gigabit ethernet card and > > possibly some from IBM as well, though I don't know the PCI vendor/device > > IDs for those so I can't be sure (if you find them out, you can try > > hacking them into the driver). All of these are supported by the same > > driver because they're all OEMed from Alteon. > > We have two of the NetGear GA620's here, and they work quite nicely. I use > them for testing throughput via Gig-E on our switches. Mine is running in > a lowly PII/233, on a 32-bit x 33 Mhz slot, and can push bits at 320 Mbps. > The GA620 will work in any 32 or 64 bit, 33 or 66 Mhz slot. A 64x66 slot > would probably speed things up appreciably. I doubt a faster PCI interface would really speed things up. My guess is that you've got some other bottleneck other than PCI bandwidth. Is the CPU pegged on either end? I would recommend that you make sure you've got a couple of things tweaked, they may increase your performance somewhat: - set your MTU to 9000, unless of course you're going through a switch that can't handle it - turn on net.inet.tcp.rfc1323, it enables support for TCP windows larger than 64K - increase net.inet.tcp.sendspace and net.inet.tcp.recvspace to 256K. You'll have to edit src/sys/socketvar.h and increase SB_MAX. From what I've seen (this may not be quite correct, but it's close enough) SB_MAX has to be double whatever you want to set sendspace and recvspace to. This has the effect of changing the TCP window size to 256K, I think. From what I've seen, increasing it to 512K is counterproductive unless you've got a card with 1MB of SRAM on board. (The Netgear boards have 512K.) And finally, netperf seems to work reasonably well for testing performance: http://www.netperf.org > They're relatively cheap, too, going for $339 at DataComm Warehouse. FWIW, NECX has them for $310. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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