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Date:      Mon, 31 Dec 2012 07:53:58 -0800 (PST)
From:      Barney Cordoba <barney_cordoba@yahoo.com>
To:        linimon@FreeBSD.org
Cc:        freebsd-net@freebsd.org
Subject:   Re: kern/174851: [bxe] [patch] UDP checksum offload is wrong in bxe driver
Message-ID:  <1356969238.85857.YahooMailClassic@web121602.mail.ne1.yahoo.com>
In-Reply-To: <201212310728.qBV7SPKC064686@freefall.freebsd.org>

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

> From: linimon@FreeBSD.org <linimon@FreeBSD.org>
> Subject: Re: kern/174851: [bxe] [patch] UDP checksum offload is wrong in bxe driver
> To: linimon@FreeBSD.org, freebsd-bugs@FreeBSD.org, freebsd-net@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



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