netdev - Re: [PATCH] ucc_geth: Rework the TX logic.

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Message-ID: <OF3127420C.081D4097-ONC1257589.00603E3D-C1257589.006093B3@transmode.se>
Date:	Mon, 30 Mar 2009 19:34:53 +0200
From:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Li Yang <leoli@...escale.com>, linuxppc-dev@...abs.org,
	netdev@...r.kernel.org, pku.leo@...il.com
Subject: Re: [PATCH] ucc_geth: Rework the TX logic.

Scott Wood <scottwood@...escale.com> wrote on 30/03/2009 19:22:03:
> 
> Joakim Tjernlund wrote:
> > gianfar does not seem to use in_/out_ functions for the BDs. Works 
just
> > fine that too it seems.
> 
> It does now that it has explicit barriers in a few places.  Before they

In 2.6.29 or later?
 
> were added, it would sometimes fail under load.  That was due to a 
> compiler reordering, but CPU reordering was possible as well.

Does not the CPU skip reordering if the guarded bit is set?

Could we not use the same in ucc_geth as well? Then people would
not need to worry about "performance issues".

 Jocke
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