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Message-ID: <8bd0f97a0905291521m35731e0bra828cb09d0929974@mail.gmail.com> 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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