From: Chris Wedgwood <cw@f00f.org>
To: Michael Lindner <mikel@att.net>
Cc: 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 12:31:39 +1300 [thread overview]
Message-ID: <20010120123139.B549@metastasis.f00f.org> (raw)
In-Reply-To: <3A68A7D0.FF534B97@att.net>
In-Reply-To: <3A68A7D0.FF534B97@att.net>; from mikel@att.net on Fri, Jan 19, 2001 at 03:47:12PM -0500
main()
{
for (int i = 0; i < 1000; i++) {
struct timeval to;
to.tv_sec = 0;
to.tv_usec = 1000;
select(0, 0, 0, 0, &to);
}
return 0;
}
ia32 with HZ=100 means sleep will sleep for 10ms each time, no less.
The time passed to slect is a _minimum_ the kernel make no guarantee
it will be less, but assures it will be more (10ms is the default
timer interval for the intel platform, others (e.g. alpha) differ)
run your conde with strace -t to see what i mean
--cw
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next prev parent reply other threads:[~2001-01-19 23:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-19 20:47 PROBLEM: select() on TCP socket sleeps for 1 tick even if data available 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 [this message]
[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 ` Michael Lindner
2001-01-20 7:07 ` Chris Wedgwood
2001-01-20 7:46 ` Michael Lindner
2001-01-20 21:58 ` Edgar Toernig
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
-- strict thread matches above, loose matches on Subject: below --
2001-01-20 10:53 Bernd Eckenfels
2001-01-24 23:56 Bernd Eckenfels
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