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Date: Sat, 12 Jan 2008 09:10:57 +1100 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Eugene Surovegin <ebs@...home.net> Cc: Stefan Roese <sr@...x.de>, netdev@...r.kernel.org, linuxppc-dev@...abs.org Subject: Re: [PATCH] ibm_newemac: Increase number of default rx-/tx-buffers On Fri, 2008-01-11 at 09:48 -0800, Eugene Surovegin wrote: > On Sat, Jan 05, 2008 at 01:38:17PM +0100, Stefan Roese wrote: > > On Saturday 05 January 2008, Benjamin Herrenschmidt wrote: > > > On Sat, 2008-01-05 at 10:50 +0100, Stefan Roese wrote: > > > > Performance tests done by AMCC have shown that 256 buffer increase the > > > > performance of the Linux EMAC driver. So let's update the default > > > > values to match this setup. > > > > > > > > Signed-off-by: Stefan Roese <sr@...x.de> > > > > --- > > > > > > Do we have the numbers ? Did they also measure latency ? > > > > I hoped this question would not come. ;) No, unfortunately I don't have any > > numbers. Just the recommendation from AMCC to always use 256 buffers. > > This cannot be true for all chips. Default numbers I selected weren't > random. In particular, 256 for Tx doesn't make a lot of sense for 405. > You just gonna waste memory. > > I'd be quite reluctant to follow such advices from AMCC without actual > details. I think we can make defaults based on other config options nowadays. Not very nice but we could do things like default 128 if PPC_40x default 256 Or even more detailed. Cheers, Ben. -- 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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