svn commit: r243714 - in head/sys/dev: ixgbe netmap
Andre Oppermann
andre at freebsd.org
Sat Dec 1 10:23:17 UTC 2012
On 01.12.2012 10:48, Jack Vogel wrote:
>
>
> On Sat, Dec 1, 2012 at 12:40 AM, Andre Oppermann <andre at freebsd.org <mailto:andre at freebsd.org>> wrote:
>
> On 30.11.2012 23:19, Jack F Vogel wrote:
>
> Author: jfv
> Date: Fri Nov 30 22:19:18 2012
> New Revision: 243714
> URL: http://svnweb.freebsd.org/__changeset/base/243714
> <http://svnweb.freebsd.org/changeset/base/243714>
>
> Log:
> First of a series of 11 patches leading to new ixgbe version 2.5.0
> This removes the header split and supporting code from the driver.
>
>
> You did this because the datasheet says the header split feature is
> not supported and using it gives unpredictable results?
>
>
> I'm not sure what the datasheet says, but yes there is a hardware issue
> on some of the 10G adapters if using header split. I have left the code in
> in a disabled state for a long time, thinking it would be there as example
> code, but I think it best to remove it and simplify the code at this point.
It says so in section 7.1.10 Header Splitting:
Note: Header Splitting mode might cause unpredictable behavior and should not
be used with the 82599. For more information, see the product specification
update errata on this subject.
> Oh, and yes, results have always been mixed with the feature in my
> experience anyway.
I can imagine. Considering how we work with the packet through the stack
and in the socket buffers there isn't much benefit from header splitting.
--
Andre
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