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

I have an impression the zero-copy technology is frequently tied up withnetwork I/O. Recently I found people in Xen community start talkingzero-copy for disk I/O as well (e.g. scsi front-end/back-end driver andblktap in Xen). So is there any difference for zero-copy between disk I/Oand 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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