Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 02 May 2003 00:19:25 -0400 | From | Chris Friesen <> | Subject | Re: sendfile |
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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
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