On Wed, 2006-05-24 at 11:42 +0200, Johannes Berg wrote: > On Wed, 2006-05-24 at 08:15 +1000, Benjamin Herrenschmidt wrote: > > > Right, that's how snd-powermac does it. It has the nasty side-effect of > > > polluting the cache a lot though, since dbdma commands are 16 bytes > > > long. Am I wrong? > > > > You don't have that much DBDMA commands that it would pollute the cache > > _a lot_ :) > > Ah, yeah, I guess so. Well I do have 32 dbdma commands, them being > spaced up in 16-bytes means 16 cachelines, no? I'm not sure how the > cache is wired up ...
On a 32 bits CPU yes. > > > Alsa calls this thing the 'pointer' :) The frame counter we currently > > > use is the frame counter register of the i2s bus controller, and I don't > > > see why we shouldn't do that instead of reading back all the dbdma > > > command status fields. > > > > If you manage to have it properly in sync, that may work too. > > Seems to work fine so far, even if bcm43xx kills a few interrupts ;) So it's bcm's fault ? Did you do a bit of analysis ? that would be useful... Ben. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
