netdev - Re: [PATCH ] pcnet32: Fix PCnet32 performance bug on non-coherent architecutres

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Message-ID: <45ED4D4A.3020004@garzik.org>
Date:	Tue, 06 Mar 2007 06:15:22 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Don Fry <pcnet32@...izon.net>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH ] pcnet32: Fix PCnet32 performance bug on non-coherent
 architecutres

Don Fry wrote:
> The PCnet32 driver always passed the the size of the largest possible packet
> to the pci_dma_sync_single_for_cpu and pci_dma_sync_single_for_device.
> This results in a fairly large "colateral damage" in the caches and makes
> the flush operation itself much slower.  On a system with a 40MHz CPU this
> patch increases network bandwidth by about 12%.
> 
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> Acked-by: Don Fry <pcnet32@...izon.net>

applied


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