On Fri, Sep 10, 2004 at 12:53:30PM -0300, Alexander Franca wrote: > Recording: > --------------------------------------------------------------------- > /dev/hda: > Timing buffer-cache reads: 820 MB in 2.01 seconds = 408.43 MB/sec > Timing buffered disk reads: 10 MB in 3.38 seconds = 2.96 MB/sec > > Without Record: > --------------------------------------------------------------------- > /dev/hda: > Timing buffer-cache reads: 852 MB in 2.01 seconds = 423.94 MB/sec > Timing buffered disk reads: 8 MB in 3.00 seconds = 2.66 MB/sec > > Recording again: > --------------------------------------------------------------------- > /dev/hda: > Timing buffer-cache reads: 812 MB in 2.00 seconds = 405.25 MB/sec > Timing buffered disk reads: 10 MB in 3.66 seconds = 2.74 MB/sec > > Runing Jack > --------------------------------------------------------------------- > /dev/hda: > Timing buffer-cache reads: 1028 MB in 2.00 seconds = 512.80 MB/sec > Timing buffered disk reads: 10 MB in 3.26 seconds = 3.07 MB/sec ooOOoo. those are really low. You should expect to be getting more on the order of 20-30 MB/sec for buffered disk reads. I've never worried about buffer-cache reads, doesn't really mean a whole lot for sustained i/o in my experience. I get upwards of 40MB/s at home on ATA133 drives. You need to tweak your kernel config and/or set some dma and other options with hdparm. -Eric Rz.
