Messages in this thread |  | | | From | "Albert D. Cahalan" <> | | Subject | Re: Is sendfile all that sexy? | | Date | Mon, 15 Jan 2001 15:33:51 -0500 (EST) |
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Ingo Molnar writes: > On Mon, 15 Jan 2001, Jonathan Thackray wrote:
>> It's a very useful system call and makes file serving much more >> scalable, and I'm glad that most Un*xes now have support for it >> (Linux, FreeBSD, HP-UX, AIX, Tru64). The next cool feature to add to >> Linux is sendpath(), which does the open() before the sendfile() all >> combined into one system call.
Ingo Molnar's data in a nice table:
open/close 7.5756 microseconds stat 5.4864 microseconds write 0.9614 microseconds read 1.1420 microseconds syscall 0.6349 microseconds
Rather than combining open() with sendfile(), it could be combined with stat(). Since the syscall would be new anyway, it could skip the normal requirement about returning the next free file descriptor in favor of returning whatever can be most quickly found.
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