Re: [Q] e1000 hardware checksumming support?

From: David S. Miller (
Date: Wed Oct 16 2002 - 16:36:34 EST

   From: Roy Sigurd Karlsbakk <>
   Date: Wed, 16 Oct 2002 16:54:05 +0200
   Can Linux 2.4 use the hardware checksumming in the e1000 adapter?

Two things:

1) On output you only get checksumming if your applications
   use sendfile()

2) On input, since we have to copy the data anyways, we use
   csum_partial_copy because it costs the same as a memcpy.

   Actually, on some x86 cpus the checksum+copy is faster
   than the memcpy, but that is being fixed in current 2.5.x

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