From: Edgar Toernig <froese@gmx.de>
To: Michael Lindner <mikel@att.net>
Cc: Chris Wedgwood <cw@f00f.org>, Dan Maas <dmaas@dcine.com>,
linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: select() on TCP socket sleeps for 1 tick even if data available
Date: Sat, 20 Jan 2001 22:58:10 +0100 [thread overview]
Message-ID: <3A6A09F2.8E5150E@gmx.de> (raw)
In-Reply-To: <fa.nc2eokv.1dj8r80@ifi.uio.no> <fa.dcei62v.1s5scos@ifi.uio.no> <015e01c082ac$4bf9c5e0$0701a8c0@morph> <3A69361F.EBBE76AA@att.net> <20010120200727.A1069@metastasis.f00f.org> <3A694254.B52AE20B@att.net>
Michael Lindner wrote:
>[...]
> send(s, ".", 1, 0);
>[...]
> while (select(r+1, &readfds, 0, 0, 0) > 0) {
>[...]
>[select returns only after about 1 HZ]
Ever heard of nagle? (If not, there's a long thread about
it on the mailing list *g*)
It's not the select that waits. It's a delay in the tcp send
path waiting for more data. Try disabling it:
int f=1;
setsockopt(s, SOL_TCP, TCP_NODELAY, &f, sizeof(f));
Ciao, ET.
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next prev parent reply other threads:[~2001-01-20 22:28 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.nc2eokv.1dj8r80@ifi.uio.no>
[not found] ` <fa.dcei62v.1s5scos@ifi.uio.no>
[not found] ` <015e01c082ac$4bf9c5e0$0701a8c0@morph>
2001-01-20 6:54 ` PROBLEM: select() on TCP socket sleeps for 1 tick even if data available Michael Lindner
2001-01-20 7:07 ` Chris Wedgwood
2001-01-20 7:46 ` Michael Lindner
2001-01-20 21:58 ` Edgar Toernig [this message]
2001-01-21 0:35 ` Dan Maas
2001-01-21 0:34 ` Chris Wedgwood
2001-01-21 1:22 ` Michael Lindner
2001-01-21 1:29 ` David Schwartz
2001-01-21 3:20 ` Michael Lindner
2001-04-09 14:54 ` Stephen D. Williams
2001-04-09 19:16 ` James Antill
2001-04-10 18:29 ` Stephen D. Williams
2001-04-10 20:25 ` James Antill
2001-04-11 21:03 ` Stephen D. Williams
2001-04-12 0:09 ` James Antill
2001-01-24 20:31 ` Boris Dragovic
[not found] ` <3A694357.1A7C6AAC@att.net>
2001-01-20 9:41 ` Dan Maas
2001-01-20 17:26 ` Michael Lindner
2001-01-24 23:56 Bernd Eckenfels
-- strict thread matches above, loose matches on Subject: below --
2001-01-20 10:53 Bernd Eckenfels
2001-01-19 20:47 Michael Lindner
2001-01-19 23:20 ` David Schwartz
2001-01-20 2:30 ` Michael Lindner
2001-01-20 3:27 ` David Schwartz
2001-01-20 4:37 ` Michael Lindner
2001-01-20 12:26 ` Martin MaD Douda
2001-01-20 11:39 ` Bjorn Wesen
2001-01-19 23:31 ` Chris Wedgwood
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