From: Davide Libenzi <davidel@xmailserver.org>
To: David Schwartz <davids@webmaster.com>
Cc: Jamie Lokier <jamie@shareable.org>,
Eric Varsanyi <e0206@foo21.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: RE: [Patch][RFC] epoll and half closed TCP connections
Date: Sun, 13 Jul 2003 16:09:23 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.55.0307131605480.15022@bigblue.dev.mcafeelabs.com> (raw)
In-Reply-To: <MDEHLPKNGKAHNMBLJOLKEEFKEFAA.davids@webmaster.com>
On Sun, 13 Jul 2003, David Schwartz wrote:
> It's not O(N) with 'poll' and 'select'. Twice as many file descriptors
> means twice as many active file descriptors which means twice as many
> discovered per call to 'poll'. If the calls to 'poll' are further apart
It is O(N), if N if the number of fds queried. The poll code does "at least"
2 * N loops among the set (plus other stuff), and hence it is O(N). Even
if you do N "nop" in your implementation, this becomes O(N) from a
mathematical point of view.
- Davide
next prev parent reply other threads:[~2003-07-13 23:02 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-12 18:16 Eric Varsanyi
2003-07-12 19:44 ` Jamie Lokier
2003-07-12 20:51 ` Eric Varsanyi
2003-07-12 20:48 ` Davide Libenzi
2003-07-12 21:19 ` Eric Varsanyi
2003-07-12 21:20 ` Davide Libenzi
2003-07-12 21:41 ` Davide Libenzi
2003-07-12 23:11 ` Eric Varsanyi
2003-07-12 23:55 ` Davide Libenzi
2003-07-13 1:05 ` Eric Varsanyi
2003-07-13 20:32 ` David Schwartz
2003-07-13 21:10 ` Jamie Lokier
2003-07-13 23:05 ` David Schwartz
2003-07-13 23:09 ` Davide Libenzi [this message]
2003-07-14 8:14 ` Alan Cox
2003-07-14 15:03 ` Davide Libenzi
2003-07-14 1:27 ` Jamie Lokier
2003-07-13 21:14 ` Davide Libenzi
2003-07-13 23:05 ` David Schwartz
2003-07-13 23:11 ` Davide Libenzi
2003-07-13 23:52 ` Entrope
2003-07-14 6:14 ` David Schwartz
2003-07-14 7:20 ` Jamie Lokier
2003-07-14 1:51 ` Jamie Lokier
2003-07-14 6:14 ` David Schwartz
2003-07-15 20:27 ` James Antill
2003-07-16 1:46 ` David Schwartz
2003-07-16 2:09 ` James Antill
2003-07-13 13:12 ` Jamie Lokier
2003-07-13 16:55 ` Davide Libenzi
2003-07-12 20:01 ` Davide Libenzi
2003-07-13 5:24 ` David S. Miller
2003-07-13 14:07 ` Jamie Lokier
2003-07-13 17:00 ` Davide Libenzi
2003-07-13 19:15 ` Jamie Lokier
2003-07-13 23:03 ` Davide Libenzi
2003-07-14 1:41 ` Jamie Lokier
2003-07-14 2:24 ` POLLRDONCE optimisation for epoll users (was: epoll and half closed TCP connections) Jamie Lokier
2003-07-14 2:37 ` Davide Libenzi
2003-07-14 2:43 ` Davide Libenzi
2003-07-14 2:56 ` Jamie Lokier
2003-07-14 3:02 ` Davide Libenzi
2003-07-14 3:16 ` Jamie Lokier
2003-07-14 3:21 ` Davide Libenzi
2003-07-14 3:42 ` Jamie Lokier
2003-07-14 4:00 ` Davide Libenzi
2003-07-14 5:51 ` Jamie Lokier
2003-07-14 6:24 ` Davide Libenzi
2003-07-14 6:57 ` Jamie Lokier
2003-07-14 3:12 ` Jamie Lokier
2003-07-14 3:17 ` Davide Libenzi
2003-07-14 3:35 ` Jamie Lokier
2003-07-14 3:04 ` Jamie Lokier
2003-07-14 3:12 ` Davide Libenzi
2003-07-14 3:27 ` Jamie Lokier
2003-07-14 17:09 ` [Patch][RFC] epoll and half closed TCP connections kuznet
2003-07-14 17:09 ` Davide Libenzi
2003-07-14 21:45 ` Jamie Lokier
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