Date: Sat, 28 Jan 2006 10:58:33 -0500 From: Chuck Swiger <cswiger@mac.com> To: Koen Martens <fbsd@metro.cx> Cc: freebsd-stable@freebsd.org Subject: Re: ipfilter + bge strangeness Message-ID: <43DB94A9.60000@mac.com> In-Reply-To: <43DB8EA6.7070503@metro.cx> References: <43DB8EA6.7070503@metro.cx>
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Koen Martens wrote:
[ ... ]
> With 5.4, there was only the rxcsum option for the bge card, not a
> txcsum. It worked fine with rxcsum enabled on 5.4..
>
> What are the consequences of disabling {rx,tx}csum? What is wrong
> with enabling it on 6-STABLE?
The consequence is your CPU has to spend the time to compute or verify packet
checksums, rather than taking advantage of the NIC's hardware support for doing so.
As for your second question, not enough data. If you send some test traffic
around and capture it with tcpdump with the various settings toggled, someone
might be able to notice something, a pattern in the way the checksums are being
computed wrong.
--
-Chuck
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