Messages in this thread |  | | Date | Fri, 9 Feb 2001 15:32:35 -0800 (PST) | From | Ion Badulescu <> | Subject | Re: [PATCH] starfire reads irq before pci_enable_device. |
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On Fri, 9 Feb 2001, Alan Cox wrote:
> > It's amusing that a full receive copy is added without any concern, in > > the same discussion where zero-copy transmit is treated as a holy grail! > > For non routing paths its virtually free because the DMA forced the lines > from cache anyway.
Are you actually sure about this? I thought DMA from PCI devices reached the main memory without polluting the L2 cache. Otherwise any large DMA transfer would kill the cache (think frame grabbers...)
Ion
-- It is better to keep your mouth shut and be thought a fool, than to open it and remove all doubt.
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