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[Xen-users] Re: [Xen-devel] Question about using zero-copy for disk I/O in Xen.


To avoid cross posting (which some people don't like) I'm replying to this 
mail on the xen-devel list as it's a technical question.


On Monday 26 February 2007 23:17, Liang Yang wrote:
> Hello,
> I have an impression the zero-copy technology is frequently tied up with
> network I/O. Recently I found people in Xen community start talking
> zero-copy for disk I/O as well (e.g. scsi front-end/back-end driver and
> blktap in Xen). So is there any difference for zero-copy between disk I/O
> and network I/O? O_DIRECT can be used to eliminate the kernel buffer copy,
> isn't it counted as part of zero-copy for disk I/O?
> Thanks,
> Liang
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Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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