Re: zero copy issue while receiving the data (counter part of sendfil e)

[Dmitry Yusupov]

indeed :)
another words if you have modern NIC than you get "zero-copy"(except
copy_to_user()) for free :)

Regards,
Dima

On Tue, 2004-12-21 at 14:30 -0500, Jeff Garzik wrote:
> Dmitry Yusupov wrote:
> > Rajat,
> > 
> > small correction, if NIC supports DMA operation on receive, than no
> > extra copy required. Therefore sock_recvmsg() and tcp_read_sock
> 
> large correction:  if NIC supports _checksum_ on receive, then no extra 
> copy is required.
> 
> 	Jeff
> 

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