Re: [RFC] New Qlogic 10Gb Ethernet driver for 2.6.28

[David Miller <davem@xxxxxxxxxxxxx>]

From: Ron Mercer <ron.mercer@xxxxxxxxxx>
Date: Mon, 25 Aug 2008 10:01:48 -0700

> I see your point.  I will add the re-alignment but would like to jump
> over it for platforms that don't need it.  Is there a list somewhere of
> the RISC platforms that take a trap on unaligned accesses?  Or better
> yet, a list of those that don't?

If you're only doing this for the header portion it's not so
much of a cost.  For sizable packets you're using page
references, and you don't have to copy those, such copies
of the headers will also warm up the CPU cache as a nice
side effect.

Furthermore you stated that the alignment restriction only
is necessary for early revisions of the hardware.

Please, I do not want to give you a list of platform names
to ifdef up your driver with, that's messy.  Just make the
copy when necessary to align things properly.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html