Re: Slave IDE HDD not working in UDMA5

From: Bruce Evans (bde_at_zeta.org.au)
Date: 06/20/05

  • Next message: scuba_at_centroin.com.br: "Re: Slave IDE HDD not working in UDMA5" 
    Date: Mon, 20 Jun 2005 22:49:00 +1000 (EST)
To: scuba@centroin.com.br

    On Thu, 16 Jun 2005 scuba@centroin.com.br wrote:

    > This was first posted on freebsd-question, but I could not find
    > the solution yet.
    > Maybe you could help me.

    Maybe a little. I don't use 5.4...

    > I´ve installed FreeBSD 5.4 on a new machine with the following
    > hardware:
    >
    > Asus P4P800 SE (BIOS v. 1008)
    > 2GB RAM ( 4x 512 DDR400 )
    > 2 HDD Samsung SP0802N (80GB 7200rpm ata-100) 80 pins cable.
    >
    > The HD were formated with newfs defaults, and the following
    > results were the same using both as master (primary e secondary) or with a
    > master / slave (same interface).
    >
    > With diskinfo both performance are the same, but with "dd", the
    > second disc (the slave or the secondary master), is always worst as if it
    > were working in DMA2.

    I remember a commit to the ata driver to fix misprogramming of DMA timing
    on an Intel chipset for devices and/or channels other than the first. I'm
    not sure if 5.4 has the bug or the fix.

    diskinfo only tests reading, and you only showed a dd test using writing
    (to a file), so the problem is apparently only that writing to the second
    drive is slow.

    > what should be the right results?

    Swap the devices to see if it is a drive problem (unlikely with the
    same model of drive but... I have one system that apparently has
    worse timing on the secondary channel. This showed up as writes
    causing subsequent reads to be slow -- apparently the writes caused
    some errors and error correction as perfect except for slowing things
    down).

    Bruce

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