Date: Mon, 15 Jul 2002 00:45:31 +0200 From: "Jose M. Alcaide" <jose@we.lc.ehu.es> To: multimedia@FreeBSD.org Subject: interrupts from pcm(4) while no sound is being played Message-ID: <20020714224531.GA784@v-ger.we.lc.ehu.es>
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I have just found something strange: there are interrupts accounted to the pcm(4) device while a process keeps it open just after playing a sound. For example: cat flush.au - > /dev/audio That command sends "flush.au" to /dev/audio followed by stdin. Using "systat -vm 1", I can see about 62-64 interrupts per second while playing the sound and also *after* playing is finished and cat(1) is waiting for input. I also noticed the same effect with esd, but with different interrupt rates (depending on the sample format and rate of the last sound played). I can reproduce the effect with an ESS Maestro/2E, a CMedia CMI8738, and a Creative CT-5880 (I have no other sound hardware available for testing). All systems are running FreeBSD 4.6-RELEASE. Is that the expected pcm(4) behaviour? Cheers, JMA -- ****** Jose M. Alcaide // jose@we.lc.ehu.es // jmas@FreeBSD.org ****** ** "Beware of Programmers who carry screwdrivers" -- Leonard Brandwein ** To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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