Date: Thu, 26 Jan 2012 20:08:17 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: current@freebsd.org Subject: timeouts too long bug again... Message-ID: <20120126190817.GA73310@onelab2.iet.unipi.it>
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In sep.2009 i noticed that usleep() select() and friends (including the in-kernel callouts) would consistently take one tick longer than they should, and committed a fix to sys/kern/kern_timeout.c to HEAD and RELENG_8 http://svnweb.freebsd.org/base?view=revision&revision=197137 http://svnweb.freebsd.org/base?view=revision&revision=200510 Now it seems that the bug is there again, in some form: on 9.0 (and someone reported this also no HEAD) the minimum sleep interval is now 2 ticks. Callouts seem to be correct (at least, dummynet delays are exact, and the sysctl net.inet.ip.dummynet.tick_adjustment: 2770 now does not grow at 500 HZ as it did in the past. Any idea on what might have reintroduced the problem ? (please spare us the story that usleep gives no guarantees etc etc - we all know that, but FreeBSD is consistently 1 tick above the minimum guaranteed interval) cheers luigi
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