From: Aaron Lehmann <aaronl@vitelus.com>
To: Andrew Morton <andrewm@uow.edu.au>
Cc: lkml <linux-kernel@vger.kernel.org>,
"netdev@oss.sgi.com" <netdev@oss.sgi.com>
Subject: Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)
Date: Fri, 26 Jan 2001 22:20:03 -0800 [thread overview]
Message-ID: <20010126222003.A11994@vitelus.com> (raw)
In-Reply-To: <3A726087.764CC02E@uow.edu.au>
In-Reply-To: <3A726087.764CC02E@uow.edu.au>; from andrewm@uow.edu.au on Sat, Jan 27, 2001 at 04:45:43PM +1100
On Sat, Jan 27, 2001 at 04:45:43PM +1100, Andrew Morton wrote:
> 2.4.1-pre10-vanilla, using read()/write(): 34.5% CPU
> 2.4.1-pre10+zercopy, using read()/write(): 38.1% CPU
Am I right to be bothered by this?
The majority of Unix network traffic is handled with read()/write().
Why would zerocopy slow that down?
If zerocopy is simply unoptimized, that's fine for now. But if the
problem is inherent in the implementation or design, that might be a
problem. Any patch which incurs a signifigant slowdown on traditional
networking should be contraversial.
Aaron Lehmann
please ignore me if I don't know what I'm talking about.
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next prev parent reply other threads:[~2001-01-27 6:20 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-27 5:45 sendfile+zerocopy: fairly sexy (nothing to do with ECN) Andrew Morton
2001-01-27 6:20 ` Aaron Lehmann [this message]
2001-01-27 8:19 ` Andrew Morton
2001-01-27 10:09 ` Ion Badulescu
2001-01-27 10:45 ` Andrew Morton
2001-01-30 6:00 ` David S. Miller
2001-01-30 12:44 ` Andrew Morton
2001-01-30 12:52 ` David S. Miller
2001-01-30 14:58 ` Andrew Morton
2001-01-30 17:49 ` Chris Wedgwood
2001-01-30 22:17 ` David S. Miller
2001-01-31 0:31 ` Chris Wedgwood
2001-01-31 0:45 ` David S. Miller
2001-01-30 22:28 ` David S. Miller
2001-01-30 23:34 ` Andrew Morton
2001-02-02 10:12 ` Andrew Morton
2001-02-02 12:14 ` Trond Myklebust
2001-02-02 17:51 ` David Lang
2001-02-02 22:46 ` David S. Miller
2001-02-02 22:57 ` David Lang
2001-02-02 23:09 ` David S. Miller
2001-02-02 23:13 ` David Lang
2001-02-02 23:28 ` Jeff Barrow
2001-02-02 23:31 ` David S. Miller
2001-02-03 2:27 ` James Sutherland
2001-01-27 10:05 ` Ion Badulescu
2001-01-27 10:39 ` Andrew Morton
2001-01-27 12:49 ` jamal
2001-01-30 1:06 ` Ion Badulescu
2001-01-30 2:48 ` jamal
2001-01-30 3:26 ` Ion Badulescu
2001-01-31 0:53 ` Still not sexy! (Re: " jamal
2001-01-31 0:59 ` Ingo Molnar
2001-01-31 1:04 ` jamal
2001-01-31 1:14 ` Ingo Molnar
2001-01-31 1:39 ` jamal
2001-01-31 11:21 ` Malcolm Beattie
2001-01-31 11:24 ` Ingo Molnar
2001-01-31 1:10 ` Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to dowith ECN) Rick Jones
2001-01-31 1:45 ` jamal
2001-01-31 2:25 ` Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing todowith ECN) Rick Jones
2001-02-04 19:48 ` jamal
2001-02-05 5:13 ` David S. Miller
2001-02-05 18:51 ` Rick Jones
2001-01-27 12:43 ` sendfile+zerocopy: fairly sexy (nothing to do with ECN) jamal
2001-01-27 13:29 ` Andrew Morton
2001-01-27 14:15 ` jamal
2001-01-28 16:05 ` Andrew Morton
2001-01-29 18:50 ` Rick Jones
[not found] ` <200101271854.VAA02845@ms2.inr.ac.ru>
2001-01-28 5:34 ` Andrew Morton
2001-01-28 13:37 ` Felix von Leitner
2001-01-28 14:11 ` Dan Hollis
2001-01-28 14:27 ` Andi Kleen
2001-01-29 21:50 ` Pavel Machek
2001-01-28 19:43 ` Gregory Maxwell
2001-01-28 19:48 ` Choosing Linux NICs (was: Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)) Felix von Leitner
-- strict thread matches above, loose matches on Subject: below --
2001-01-29 16:16 sendfile+zerocopy: fairly sexy (nothing to do with ECN) Jonathan Earle
2001-01-29 16:34 ` Antonin Kral
2001-01-31 1:49 Bernd Eckenfels
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