List Archive: gentoo-performance
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> The one thing that first pops to my head is some hdparm results I've had
> and if maybe it's either my kernel setup or how I'm testing with hdparm...
> Raptors on SATA (Model Number: WDC WD360GD-00FNA0) (-c3 -u1 -A1
> -W1 -d1 -a256 -M254 -m16 -X70 )
> Kernel config
> There's an alternative driver, but haven't tested it...
> hdparm -tT /dev/hde
> Timing cached reads: 956 MB in 2.00 seconds = 477.02 MB/sec
> Timing buffered disk reads: 116 MB in 3.03 seconds = 38.26 MB/sec
Your times for the raptor seem awfully slow.
Here the SATA settings for my kernel and my hdparm times.
antec ~ # grep SATA /usr/src/linux/.config
# CONFIG_BLK_DEV_IDE_SATA is not set
# CONFIG_SCSI_SATA_SVW is not set
# CONFIG_SCSI_SATA_MV is not set
# CONFIG_SCSI_SATA_NV is not set
# CONFIG_SCSI_SATA_QSTOR is not set
# CONFIG_SCSI_SATA_PROMISE is not set
# CONFIG_SCSI_SATA_SX4 is not set
# CONFIG_SCSI_SATA_SIL is not set
# CONFIG_SCSI_SATA_SIL24 is not set
# CONFIG_SCSI_SATA_SIS is not set
# CONFIG_SCSI_SATA_ULI is not set
# CONFIG_SCSI_SATA_VIA is not set
# CONFIG_SCSI_SATA_VITESSE is not set
antec ~ # hdparm -tT /dev/md0
Timing cached reads: 2776 MB in 2.00 seconds = 1387.91 MB/sec
Timing buffered disk reads: 398 MB in 3.00 seconds = 132.48 MB/sec
antec ~ #
Note that this is a RAID0 with two disks, so the buffered disk read time
is double what you should expect on a normal install.