kern/174851: [bxe] [patch] UDP checksum offload is wrong in bxe driver

[Barney Cordoba]

--- On Mon, 12/31/12, linimon at FreeBSD.org <linimon at FreeBSD.org> wrote:

> From: linimon at FreeBSD.org <linimon at FreeBSD.org>
> Subject: Re: kern/174851: [bxe] [patch] UDP checksum offload is wrong in bxe driver
> To: linimon at FreeBSD.org, freebsd-bugs at FreeBSD.org, freebsd-net at FreeBSD.org
> Date: Monday, December 31, 2012, 2:28 AM
> Old Synopsis: UDP checksum offload is
> wrong in bxe driver
> New Synopsis: [bxe] [patch] UDP checksum offload is wrong in
> bxe driver
> 
> Responsible-Changed-From-To: freebsd-bugs->freebsd-net
> Responsible-Changed-By: linimon
> Responsible-Changed-When: Mon Dec 31 07:28:11 UTC 2012
> Responsible-Changed-Why: 
> Over to maintainer(s).
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=174851
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> 

Has anyone done an analysis on modern hardware as to whether udp csum
offloading is actually beneficial? Even on 2007 hardware I came to the
conclusion that using offloading was a negative.

Reminds me of the days when people were using "intelligent" ethernet cards
that were slower than the host cpu. The handshaking cost you more than 
just using shared memory.

BC