Re: [patch 7/8] fdmap v2 - implement sys_socket2

From: Linus Torvalds
Date: Fri Jun 08 2007 - 14:37:05 EST

On Fri, 8 Jun 2007, Theodore Tso wrote:
> ... and it's not like sys_close() or sys_open() is a majorly critical
> path, is it?

open/close/stat/lstat are _the_ most important system calls, so yes, it's
a majorly critical path. MUCH more so than opening a new TCP connection.

You _may_ open a few hundred TCP connections a second (yeah, yeah, don't
tell me about unrealistic benchmarks that do more), but that's on a server
with good bandwidth etc. open/closes easily happen tens of _thousands_ of
times a second. We're talking sub-microsecond system calls.

Whether get_random_int() is noticeable or not, I dunno. But that path is a
hell of a lot more performance-sensitive than pretty much anything else.

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