Date: Sat, 30 Aug 1997 19:58:40 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: "David E. Cross" <dec@phoenix.its.rpi.edu> Cc: Luigi Rizzo <luigi@labinfo.iet.unipi.it>, hackers@FreeBSD.ORG, multimedia@FreeBSD.ORG Subject: Re: IRQ problem (was Re: IRQ timing) Message-ID: <199708310258.TAA00923@rah.star-gate.com> In-Reply-To: Your message of "Sat, 30 Aug 1997 20:57:04 EDT." <Pine.BSF.3.96.970830203904.15813B-100000@phoenix.its.rpi.edu>
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We need a little bit more of information: o OS version o is the card using auto dma? o dma channels being used for the sound card o name of the app o buffer size used in in the application o complete dmesg output -- i want to know cpu model, etc.. o sound card brand/model Tnks, Amancio >From The Desk Of "David E. Cross" : > 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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