Date: Mon, 19 Sep 2011 12:32:14 -0400 From: "Dieter BSD" <dieterbsd@engineer.com> To: freebsd-hackers@freebsd.org Subject: Re: checksum offload Message-ID: <20110919163215.212610@gmx.com>
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>>> The data sheet for intel 82576 advertises IP TX/RX checksum offload >>> but the driver does not set CSUM_IP in ifp->if_hwassist. Does this mean >>> that driver (and chip) do not support IP TX checksum offload or the >>> support for TX is not yet included in the driver? >> >> The first question is "is checksum offload a good idea?" >> There is less protection against errors. > > This assumes firmware flaws, right? Albeit, it also does confuse some > software like tcpdump. "Unfortunately lots of high performance people use checksum offload which removes much of the end to end protection" Alan Cox http://kerneltrap.org/Linux/Data_Errors_During_Drive_Communication Bugs in the hardware/firmware/software are not required to have a problem, but if present would make things even worse.
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