FC3 comes with a 2.6.9-1 kernel, and on my SATA controller 00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) IDE Controller (rev 02) 00:1f.2 IDE interface: Intel Corp. 82801EB (ICH5) SATA Controller (rev 02) I'm measuring a rather curious ever-increasing disk performance. Repeatedly giving the command hdparm -t /dev/sda I get to see: Timing buffered disk reads: 156 MB in 3.03 seconds = 51.41 MB/sec Timing buffered disk reads: 304 MB in 3.01 seconds = 101.15 MB/sec Timing buffered disk reads: 440 MB in 3.00 seconds = 146.54 MB/sec Timing buffered disk reads: 572 MB in 3.01 seconds = 190.13 MB/sec Timing buffered disk reads: 686 MB in 3.02 seconds = 227.11 MB/sec ... of course this can't be right. Also, if the first estimate is correct/accurate, it's slightly less than the 55 i measured on a 2.4 kernel with RHEL3! I should also add that unlike in FC3-test3, i'm now getting an error message: # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 862 MB in 3.02 seconds = 285.00 MB/sec BLKFLSBUF failed: Operation not supported HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported which may or may not be related to the ever increasing disk i/o speed. I suspect it's the kernel, but I would appreciate if poeple could do this test repeatedly on their SATA, SCSI and/or IDE drives to see what bucket isn't being reset. - peter
