Date: Fri, 28 Sep 2001 09:52:18 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: tlambert2@mindspring.com Cc: Jonathan Lemon <jlemon@flugsvamp.com>, the_srinivas@hotmail.com, hackers@freebsd.org Subject: Re: TCP&IP cksum offload on FreeBSD 4.2 Message-ID: <15284.32914.874966.260722@grasshopper.cs.duke.edu> In-Reply-To: <3BB42E50.B32F5E95@mindspring.com> References: <200109270157.f8R1vZ546863@prism.flugsvamp.com> <3BB42E50.B32F5E95@mindspring.com>
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Terry Lambert writes: > Jonathan Lemon wrote: > > >I'm trying to use the TCP&IP checksum offload capability of the Netgear > > >GA620 NIC from a SMP FreeBSD 4.2R system running on a typical PIII SBC. <..> > > He didn't say his packet size, either. > > To the original poster: if you are sending jumbograms, the > buffer size on these cards is limited, so the entire packet > can't be in the card buffer at the same time, which means > that you can not offload the send checksum for jumbograms, > only for regular sized packets. This is an Alteon Tigon-2 (ti driver) based card with 512K of sram on board. It has plenty of space for offloading transmit checksums on jumbo frames. Perhaps you're thinking of the DP83820/DP83821 (nge driver), which cannot compute the checksum on an outgoing frame unless it fits in the 8K tx fifo. I think NetGear sells a card with a similar name (GA622T) based around this chip. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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