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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This archive was generated by hypermail 2b29 : Thu Feb 15 2001 - 21:00:14 EST