Messages in this thread | | | Date | Thu, 11 Nov 1999 02:50:14 +0100 | From | Jens Axboe <> | Subject | Re: APM killing low-latency performance on BX mainboard (we need a method to disable it dynamically) |
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On Wed, Nov 10 1999, Benno Senoner wrote: > I discovered a small (but easy to correct) problem: > > by default ATAPI CDROM driver run with DMA , unmaskirq and 32bit I/O > all three disabled. You can tune this using > hdparm -d 1 -u 1 -c 1 /dev/hdc or so , but the problem is that > you can't do this when there is no CD in the drive.
That's the _old_ O_NONBLOCK bug again. The distros should fix hdparm - there's nothing preventing your from changin parameters without a disc in the drive.
-- * Jens Axboe <axboe@image.dk> * Linux CD-ROM Maintainer * http://www.kernel.dk
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