Mark Mielke wrote:
> As far as I understand, sendfile() still requires the data to get from the
> disk to a page in memory, similar to how send() referencing an mmap()'d page
> may cause a page fault, reading the data from disk to a page in memory. One
> copy each. I don't know of a kernel interface that lets data be copied from
> disk to ethernet card without involving a temporary copy to be in paged
> memory at some point in time... perhaps the iSCSI stuff can do this? I dunno.
According to this:
http://asia.cnet.com/builder/program/dev/0,39009360,39062783,00.htm
using sendfile() is easier on the CPU due to less trashing of the TLB.
I do get your point about protocol limitiations though.
Chris
-- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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