From: Dave Hansen <haveblue@us.ibm.com>
To: John Heffner <jheffner@psc.edu>
Cc: netdev@oss.sgi.com
Subject: Re: A case AGAINST checksum offload
Date: Fri, 12 Nov 2004 15:53:45 -0800 [thread overview]
Message-ID: <1100303625.14465.631.camel@localhost> (raw)
In-Reply-To: <Pine.LNX.4.58.0411121644150.8989@dexter.psc.edu>
On Fri, 2004-11-12 at 15:46, John Heffner wrote:
> Currently with many common Ethernet devices in Linux, hardware TCP
> checksumming is enabled by default. This seems fairly dangerous to me.
> Most link layer checksums are much stronger than the TCP/UDP checksum;
> most bit errors are caught by these. However, one of the primary purposes
> of the TCP/UDP checksum is to detect errors occurring outside the
> protection of the link layer checksums -- errors when data is reassembled
> or copied across busses inside hosts and routers.
If you're getting errors copying things on buses inside of the machine,
don't you have bigger problems than corrupt packets? For instance, why
doesn't your disk controller have the same problem?
Just curious.
-- Dave
next prev parent reply other threads:[~2004-11-12 23:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-12 23:46 A case AGAINST checksum offload John Heffner
2004-11-12 23:49 ` David S. Miller
2004-11-13 0:36 ` John Heffner
2004-11-13 0:29 ` David S. Miller
2004-11-12 23:53 ` Dave Hansen [this message]
2004-11-12 23:56 ` John Heffner
2004-11-13 11:32 ` Francois Romieu
2004-11-14 20:01 ` Florian Weimer
2004-11-14 22:19 ` Pekka Pietikainen
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