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Crappy SATA performance on asus p5q

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  • #16
    Originally posted by StringCheesian View Post
    So with the exact same model of HD (correct?) ivanovic is getting 107MB/s and Dan Harris is getting 91MB/s.

    What motherboards, kernel versions, and IO schedulers are you two using?
    I am using debian lenny 2.6.26-amd64 motherboard asus p5q as for scheduler I think I am using the following.

    [ 1.041322] io scheduler cfq registered (default)

    My HDD SAMSUNG HD103UJ so yes both same

    Dan
    Last edited by Dan Harris; 10-13-2008, 03:12 PM.

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    • #17
      Originally posted by Dan Harris View Post
      I am using debian lenny 2.6.26-amd64 motherboard asus p5q as for scheduler I think I am using the following.

      [ 1.041322] io scheduler cfq registered (default)

      My HDD SAMSUNG HD103UJ so yes both same

      Dan
      After about 6 hours of use last night the HD performance got progressively better and this morning hdparm show the following

      /dev/sda:
      Timing cached reads: 4942 MB in 2.00 seconds = 2471.38 MB/sec
      Timing buffered disk reads: 326 MB in 3.00 seconds = 108.58 MB/sec

      so all is well now. I guess a new hdd need running in for several hours to get it up to its best performance. I must admit when I was getting results as low as 78 MB/Sec I thought that I had a dud but a few hours later and all it well.

      Thanks for all your help and info.

      Dan

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      • #18
        Although not directly related, here is something I experienced. I have a Gigabyte EP43-DS3L mobo with ICH10. And using a a seagate sata2 500gb hard disk - ST3500320AS. There is something funny about the AHCI controller. With kernels 2.6.26 and older, with AHCI turned on, I used to get 55MB/s and with AHCI off, I get 110MB/s. (Note that the SATA controller is enabled in both cases in the bios.) However, in Windows, it was 110MB/s in both cases. With latest kernel 2.6.27, it was fixed and now I get close to 110MB/s with AHCI enabled too. (The only thing I hate about enabling AHCI is that some crappy intel ahci bios application called iSrc takes more time at starting up, than an entire os bootup possibly.)

        The only difference I see between 2.6.26 and 2.6.27 is that in dmesg output, I now see a new extension called 'ems' :
        ahci 0000:00:1f.2: AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3f impl SATA mode
        ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pmp pio slum part ems
        In general, I haven't seen any benefit of this AHCI regarding performance on any machine - including my notebooks with ich7m and ich8m. May be just some power saving or such.
        Last edited by hdas; 10-14-2008, 06:42 AM.

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