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Re: Hardware IP checksums

To: Andrew Morton <andrewm@xxxxxxxxxx>
Subject: Re: Hardware IP checksums
From: Artur Skawina <skawina@xxxxxxxxxxxxx>
Date: Mon, 24 Apr 2000 19:12:34 +0200
Cc: kuznet@xxxxxxxxxxxxx, netdev@xxxxxxxxxxx
References: <200004241544.TAA08437@xxxxxxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
> It appeared pretty useless. Jes noticed this first time,
> I had to check this experimentally, and yes... No visible improvements.
> HW checksum on transmit looks really not useful without zero copy.

for example on p2 the extra checksumming cost (vs a plain copy) is ~7%,
and that's the worst case, ie everything cached. Add cache misses and
the difference won't be visible...

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