Date: Fri, 5 Jun 1998 08:29:11 +1000 From: Bruce Evans <bde@zeta.org.au> To: current@FreeBSD.ORG, straka@home.com Subject: Re: strange behavior with signal latencies Message-ID: <199806042229.IAA23654@godzilla.zeta.org.au>
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>In looking at the results, I noticed that that the current box exhibited >a 2300 microsecond additional delay every 10th signal or at 100ms >intervals. Also, occationally a signal is missed. I have also noticed >recently using top and systat that current has been consuming between >1.6% and 3.1% of my P133 in interrupt handling. This seems to >correspond to the latancy I am seeing with the signal test code. I >changed the quantum interval using sysctl to 20 ticks. This had no >effect, the 2300 microsecond latency still appeared at 10Hz. > >The results with 2.2.6R on the 486-100 box showed no signs of the >latency and appeared to always reliably wakeup on every signal. Also, >when the machine is completely idle, the interrupt load is 0.0%, >occationally jumping to 0.4% when the disks sync. The results show no signs of latency with -current on a P5/133 here. This should be relatively easy to debug - just find whatever is causing the abnormal interrupt load. I suspect it is an interrupt handler looping. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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