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

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

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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