linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <alpine.LFD.0.98.0706081132150.4205@woody.linux-foundation.org>
Date:	Fri, 8 Jun 2007 11:35:56 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Theodore Tso <tytso@....edu>
cc:	Davide Libenzi <davidel@...ilserver.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

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.

		Linus
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