[gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda
Hello, I have a Intel SATA controler in my laptop and it is adressed as /dev/sda. My cdrom is /dev/hdc. My cdrom drive I can configure with hdparm to use dma and 32-bit io and it has a nice speed: /dev/hdc: Timing cached reads: 1408 MB in 2.00 seconds = 702.55 MB/sec Timing buffered disk reads:4 MB in 5.56 seconds = 736.64 kB/sec I can not use hdparm to configure /dev/sda, also sdparm can not set anything: sdparm --set UDMA6=1 /dev/sg0 /dev/sg0: ATA HTS726060M9AT00 MH4O change_mode_page: failed setting page: SAT pATA control This happens with all options, also awre, arre and wce. The speed of this disk: /dev/sda: Timing cached reads: 1424 MB in 2.00 seconds = 711.96 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 114 MB in 3.00 seconds = 37.95 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Now I tryed a old Gentoo 1.4-rc1 livecd, cause this one loads the disk still as /dev/hda and not sda. After enabling dma, 32bit io and udma: hdparm -X66 -c1 -d1 It had a speed of 2560.00 MB/sec bufferd and 37,65 unbufferd. It was almost 4 times as fast. Why is it that when I use the new kernel SATA drivers and load is as /dev/sda it is slower as with the old IDE drivers? Mivz -- gentoo-dev@gentoo.org mailing list
Re: [gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda
On Wed, Jun 07, 2006 at 10:07:07PM +0200, Mivz wrote: Why is it that when I use the new kernel SATA drivers and load is as /dev/sda it is slower as with the old IDE drivers? You didn't tell us which sata drivers you were using, nor what kernel version. Either way, try asking this on the linux-kernel or linux-ide mailing lists, gentoo-dev isn't the right place for it. good luck, greg k-h -- gentoo-dev@gentoo.org mailing list
Re: [gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda
Mivz wrote: /dev/sda: Timing cached reads: 1424 MB in 2.00 seconds = 711.96 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 114 MB in 3.00 seconds = 37.95 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Now I tryed a old Gentoo 1.4-rc1 livecd, cause this one loads the disk still as /dev/hda and not sda. After enabling dma, 32bit io and udma: hdparm -X66 -c1 -d1 It had a speed of 2560.00 MB/sec bufferd and 37,65 unbufferd. The unbuffered speed is identical, the cached read is the only difference. Cached reads are not a test of hard disk performance, this is a mostly useless benchmark (note that on that metric, your cdrom drive performs at the same speed as your hard disk...) Daniel -- gentoo-dev@gentoo.org mailing list
