Messages in this thread | | | Date | Fri, 24 Sep 1999 09:45:04 -0700 | From | Pete Wyckoff <> | Subject | Re: zero-copy TCP fileserving |
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alan@lxorguk.ukuu.org.uk said: > Yep. Chances of the Linux community being told how to use the feature is > approximately NIL however
[ feature == ethernet hardware checksum on transmit ]
I added small modifications a while back to 2.2.3 to use this, with a packet engines gigE card. The driver sets a bit in the dev structure saying it knows how to do tx checksum, then the IP output path notices and does only the pseudo header. Hardware adds in the packet body checksum.
The impact on bandwidth was, however, minimal. At least for 500 MHz alpha machines. Perhaps somebody with a slower machine will be happier with the percentage improvements.
Kernel changes: http://dancer.ca.sandia.gov/~pw/tx-checksum-2.2.3.diff.gz
Packet Engines device driver changes: http://dancer.ca.sandia.gov/~pw/stock-0.07-checksum.diffs.gz
-- Pete
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