From: kuznet@ms2.inr.ac.ru
To: ionut@cs.columbia.edu (Ion Badulescu)
Cc: davem@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [UPDATE] Zerocopy patches, against 2.4.1-pre10
Date: Sat, 27 Jan 2001 21:39:44 +0300 (MSK) [thread overview]
Message-ID: <200101271839.VAA02790@ms2.inr.ac.ru> (raw)
In-Reply-To: <Pine.LNX.4.30.0101261648280.20615-100000@age.cs.columbia.edu> from "Ion Badulescu" at Jan 26, 1 04:55:05 pm
Hello!
> verify this? The only way I can think of is to verify that the checksum
> field is zero initially, correct?
It is not zero. It contains checksum of pseudoheader.
> fits the new Linux model a bit better, as it has one descriptor per
> packet, not one per fragment (like the current implementation).
Yes. Absence of such mode with acenic is big pain in ass.
> tinygrams. A TCP packet whose second fragment is 1-byte long usually goes
> over the wire with the wrong checksum. If the second fragment is 3-byte
> long, it is checksummed correctly (so it's not an even/odd problem).
Seems, this is pretty common bug. At least, perfect checksumming
of chunks with any size and alignment is so big boast of
alteon people, that it is clearly rather exception than rule. 8)8)
I think you have to check for wrong combination of alignment/size and
to call skb_checksum_help() and to disable checksumming if combination
is bad.
Alexey
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next prev parent reply other threads:[~2001-01-27 18:40 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200101242123.NAA00986@pizda.ninka.net>
2001-01-25 1:40 ` [UPDATE] Zerocopy patches, against 2.4.1-pre10 Andrew Morton
2001-01-25 19:29 ` kuznet
2001-01-25 20:28 ` Ion Badulescu
2001-01-25 20:36 ` kuznet
2001-01-25 20:43 ` David S. Miller
2001-01-25 21:11 ` Ion Badulescu
2001-01-26 19:43 ` kuznet
2001-01-29 22:02 ` David S. Miller
2001-01-25 21:14 ` David S. Miller
2001-01-25 21:29 ` Steve Whitehouse
2001-01-31 16:04 ` Alan Cox
2001-03-11 20:55 ` NBD Fix (attempt #2) Steve Whitehouse
2001-01-25 21:38 ` [UPDATE] Zerocopy patches, against 2.4.1-pre10 David S. Miller
2001-01-26 6:06 ` Ion Badulescu
2001-01-26 13:13 ` David S. Miller
2001-01-26 20:43 ` Ion Badulescu
2001-01-27 0:55 ` Ion Badulescu
2001-01-27 18:39 ` kuznet [this message]
2001-01-27 21:18 ` Ion Badulescu
2001-01-30 6:02 ` David S. Miller
2001-01-26 1:27 ` Andrew Morton
2001-01-25 9:29 ` David S. Miller
2001-01-24 21:52 Jonathan Earle
2001-01-24 23:33 ` Peter Samuelson
-- strict thread matches above, loose matches on Subject: below --
2001-01-24 21:34 Jonathan Earle
2001-01-24 21:45 ` Mathieu Chouquet-Stringer
2001-01-31 22:42 ` Rogerio Brito
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