netdev - Re: [patch sungem] improved locking

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Date:	Wed, 29 Nov 2006 11:19:34 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.lemoine@...il.com, netdev@...r.kernel.org
Subject: Re: [patch sungem] improved locking

On Tue, 2006-11-28 at 15:43 -0800, David Miller wrote:

> At least in theory the atomic + any necessary memory barriers
> would be cheaper than the extra PIO read we need otherwise.

Yes, IO reads are generally the worst case scenarios even on machines
with fairly slow locks.

Ben.


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