Messages in this thread | | | Date | Mon, 8 Mar 2004 10:41:19 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] 2.6 ide-cd DMA ripping |
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On Sun, Mar 07 2004, Sean Neakums wrote: > Jens Axboe <axboe@suse.de> writes: > > > On Sat, Mar 06 2004, Sean Neakums wrote: > >> Jens Axboe <axboe@suse.de> writes: > >> > >> > Hi, > >> > > >> > 2.6 still uses PIO for CDROMREADAUDIO cdda ripping, which is less than > >> > optimal of course... This patch uses the block layer infrastructure to > >> > enable zero copy DMA ripping through CDROMREADAUDIO. > >> > > >> > I'd appreciate people giving this a test spin. Patch is against > >> > 2.6.4-rc1 (well current BK, actually). > >> > >> Applied successfully to 2.6.4-rc1-mm2, and it works great. For some > >> reason, on two different machines, ripping with cdparanoia used to > >> somehow crowd out the serial port, but now everything just works. > > > > cd ripping was highly cpu intensive when it ran in pio, so it's very > > likely that this screwed up your serial port communication. It doesn't > > matter with the patch, but had you used hdparm -u1 on your cd device > > on an unpatched kernel, you would have had better luck. > > I had a look, just for pig iron, and hdparm -u on one of the machines > reports that it is already enabled. That machine is SMP with two > 1.13GHz PIIIs. I can't check the other machine as the drive in > question is no longer functional.
Then isr runtime was likely too high, even with interrupt masking enabled. So just be glad that it works with dma :)
-- Jens Axboe
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