From: GolovaSteek <golovasteek@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: nanosleep() accuracy
Date: Fri, 17 Aug 2007 02:52:03 +0400 [thread overview]
Message-ID: <f40fb4250708161552ub87bf8ve8168eec1b3955e7@mail.gmail.com> (raw)
Hello!
I need use sleep with accurat timing.
I use 2.6.21 with rt-prempt patch.
with enabled rt_preempt, dyn_ticks, and local_apic
But
req.tv_nsec = 300000;
req.tv_sec = 0;
nanosleep(&req,NULL)
make pause around 310-330 microseconds.
I tried to understend how work nanosleep(), but it not depends from
jiffies and from smp_apic_timer_interrupt.
When can accuracy be lost?
And how are process waked up?
GolovaSteek
next reply other threads:[~2007-08-16 22:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-16 22:52 GolovaSteek [this message]
2007-08-17 7:00 ` Michal Schmidt
2007-08-17 7:44 ` GolovaSteek
2007-08-17 7:54 ` Jan Engelhardt
2007-08-17 11:08 ` Michal Schmidt
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