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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


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Old 01-23-2005, 03:12 AM   #1
Registered: Oct 2003
Posts: 40

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ata vs ahci performance?

I have a kernel that works with both on my dimension 8400 with an 80GB SATA drive.

When i run hdparm -tT on my drive, I get
Timing cached reads: 4108 MB in 2.00 seconds = 2052.26 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
Timing buffered disk reads: 106 MB in 3.03 seconds = 34.97 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device

consistently. When I run the same test booted up in ATA config, I USUALLY get the same, but sequential tests yield faster buffered disk reads, the highest I got was about 150MB/sec.

Does this make sense, does it point to a problem with the ahci driver? Thoughts comments?


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