Hi, On Tuesday 19 February 2008, Borislav Petkov wrote: > Hi Bart, > > here's one more item from my TODO list. The removal is straight forward, after > testing it with all my cdrom drives they all seem even to rotate quieter due > to > the automatic speed adjustment of the drive to the continuous data stream > bandwidth in contrast to the buffer-mode in which recurring buffer-fill > speedups > caused the drive's read speeed to spike in order to keep the buffer filled up > constantly. > > Still, i'd keep this a bit longer in -mm to see whether there are some > other issues with it and with all the different workloads. > > > commit a855bd5d94ddac678cf90b4b8f20dbd3ac8ea29a > Author: Borislav Petkov <[EMAIL PROTECTED]> > Date: Tue Feb 19 14:25:09 2008 +0100 > > ide-cd: remove the internal 64k buffer > > This removes the internal ide-cd buffer and falls back to read-ahead > block layer > capabilities. Thorough testing (cd burning, dvd read, raw read) gives > with the > bufferless mode marginally better performance in addition to simplified > code. > > bufferless: > > dd: reading `/dev/hdc': Input/output error > 6238+0 records in > 6238+0 records out > 204406784 bytes (204 MB) copied, 259.891 s, 787 kB/s > > real 4m21.598s > user 0m0.014s > sys 0m0.744s > > with the old buffer (2.6.25-rc1): > > dd: reading `/dev/hdc': Input/output error > 6238+0 records in > 6238+0 records out > 204406784 bytes (204 MB) copied, 262.893 s, 778 kB/s > > real 4m22.938s > user 0m0.009s > sys 0m0.771s > > Signed-off-by: Borislav Petkov <[EMAIL PROTECTED]>
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