netdev - Re: [Uclinux-dist-devel] [PATCH 1/5] netdev: bfin_mac: Blackfin EMAC interrupt may not be shared

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Date:	Fri, 29 May 2009 18:21:41 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Michael.Hennerich@...log.com, netdev@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [Uclinux-dist-devel] [PATCH 1/5] netdev: bfin_mac: Blackfin EMAC 
	interrupt may not be shared

On Fri, May 29, 2009 at 18:18, David Miller wrote:
> From: Mike Frysinger <vapier.adi@...il.com>
>> the difference is that one of these is required in order for anything
>> to get done and the other is always useless noise.  also, the Blackfin
>> core does do speculative data fetching on external memory, but not
>> MMRs, so the stalling due to the data cache line fills will be
>> mitigated unlike the useless MMR reads.
>
> You only need to read the register if the descriptor status is not
> ready yet, and you're just spinning in that case anyways.
>
> I doubt it makes any real difference if implemented properly.
>
> But I guess it's more fun to speculate than to actually try it out.
> :-/

and i guess it's more fun to waste time attempting to support an
operating mode that the hardware has never and most likely will never
support
-mike
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