Date: Sat, 30 Aug 1997 20:57:04 -0400 (EDT) From: "David E. Cross" <dec@phoenix.its.rpi.edu> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.ORG, multimedia@FreeBSD.ORG Subject: Re: IRQ problem (was Re: IRQ timing) Message-ID: <Pine.BSF.3.96.970830203904.15813B-100000@phoenix.its.rpi.edu> In-Reply-To: <199708301629.SAA03050@labinfo.iet.unipi.it>
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On Sat, 30 Aug 1997, Luigi Rizzo wrote: > > I just sent a message to the OSS people, and they mentioned that some of > > the problem I am experiencing is a result of some tight IRQ timing that > > the FreeBSD kernel has (ie, it takes too long to transfer the data). I > > > would you care to mention what problem are you experiencing ? > > Curiously I have a related question, so hope people would excluse the > crosspost.. > The exact problem is that at the highest sampling rate (44.1KHz/16Bit/Stereo) I get skips in the music, even in an unloaded system. I emailed 4front-tech about this and said that it was a known problem due to FreeBSD's tightness in the IRQ code. I was hoping that this was something that could be fairly easily changed (ie. a #define somewhere). (They did mention that they had spoken to some of the kernel team about this). Are there any beta patches, or pointers where to start digging. I have already started poking arround in /usr/src/sys/i386/isa. -- David Cross ACS Consultant
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