Date: Sun, 31 Aug 1997 06:24:16 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hasty@rah.star-gate.com (Amancio Hasty) Cc: dec@phoenix.its.rpi.edu, hackers@FreeBSD.ORG, multimedia@FreeBSD.ORG Subject: Re: IRQ problem (was Re: IRQ timing) Message-ID: <199708310424.GAA03702@labinfo.iet.unipi.it> In-Reply-To: <199708310523.WAA00779@rah.star-gate.com> from "Amancio Hasty" at Aug 30, 97 10:22:44 pm
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> > > o buffer size used in in the application > > > > i guess you also need the blocksize -- the size of each DMA transfers > > -- and not only the total amount of buffers. > > True but bear in mind that the system has plenty of memory: ... > I would hope that the OSS driver has the heuristics to allocate > sufficient memory for the buffers. I think the default is 64K (seen in some include file). What I am not sure about is if the blocksize for DMA transfer is determined adaptively if the user does not call some SETFRAGMENT or SUBDIVIDE ioctl. In my code I wrote some code to use 0.25s of audio for each DMA transfer unless the user specifies elsewhere (using the above calls or the new one that I introduced, AIOSSIZE). What about guspnpXX ? Luigi
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