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    SubjectStrange IDE performance observations

    I strongly suspect that what I'm about to describe is due either to a flaky
    motherboard or a harddrive going bad, as opposed to a kernel or config
    issue. I'm hoping someone here can confirm. <beg>Andre?</beg>

    I've tried researching deja/usenet for answers, but really didn't find
    anything that I could piece together.

    First, some filtered output from dmesg:

    Linux version 2.2.14 (root@thune) (gcc version 2.95.2 19991024 (release)) #5 Mon Mar 6 20:41:52 CST 2000
    Detected 233224515 Hz processor.
    Calibrating delay loop... 465.31 BogoMIPS
    Memory: 79676k/81920k available (756k kernel code, 412k reserved, 1020k data, 56k init)
    Dentry hash table entries: 16384 (order 5, 128k)
    Buffer cache hash table entries: 131072 (order 7, 512k)
    Page cache hash table entries: 32768 (order 5, 128k)
    CPU: Intel Pentium MMX stepping 03
    PCI: PCI BIOS revision 2.10 entry at 0xfb000
    PCI: Using configuration type 1
    PCI: Probing PCI hardware
    Uniform Multi-Platform E-IDE driver Revision: 6.30
    PIIX3: IDE controller on PCI bus 00 dev 39
    PIIX3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
    hda: Maxtor 82560A4, ATA DISK drive
    hdb: Maxtor 91303D6, ATA DISK drive
    hdc: Maxtor 93652U8, ATA DISK drive
    hdd: Maxtor 92048U8, ATA DISK drive
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    ide1 at 0x170-0x177,0x376 on irq 15
    hda: Maxtor 82560A4, 2442MB w/256kB Cache, CHS=620/128/63, DMA
    hdb: Maxtor 91303D6, 12427MB w/512kB Cache, CHS=25249/16/63, (U)DMA
    hdc: Maxtor 93652U8, 34837MB w/2048kB Cache, CHS=70780/16/63, (U)DMA
    hdd: Maxtor 92048U8, 19470MB w/2048kB Cache, CHS=39560/16/63, (U)DMA

    Now some output from hdparm 3.6 (note it gets the 93652U8 wrong, but then
    so does fdisk 2.10d, but it *seems* to work, so far):
    /dev/hda:
    multcount = 16 (on)
    I/O support = 1 (32-bit)
    unmaskirq = 1 (on)
    using_dma = 1 (on)
    keepsettings = 1 (on)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 620/128/63, sectors = 5001728, start = 0

    Model=Maxtor 82560A4, FwRev=AA8Z2726, SerialNo=C40JRRRA
    Config={ Fixed }
    RawCHS=4962/16/63, TrkSize=0, SectSize=0, ECCbytes=20
    BuffType=3(DualPortCache), BuffSize=256kB, MaxMultSect=16, MultSect=16
    DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=2
    CurCHS=4962/16/63, CurSects=5001696, LBA=yes, LBAsects=5001728
    tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4


    /dev/hdb:
    multcount = 16 (on)
    I/O support = 1 (32-bit)
    unmaskirq = 1 (on)
    using_dma = 1 (on)
    keepsettings = 1 (on)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 25249/16/63, sectors = 25450992, start = 0

    Model=Maxtor 91303D6, FwRev=GAS54112, SerialNo=A609WPDC
    Config={ Fixed }
    RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=29
    BuffType=3(DualPortCache), BuffSize=512kB, MaxMultSect=16, MultSect=16
    DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=2
    CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=25450992
    tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
    UDMA modes: mode0 mode1 mode2


    /dev/hdc:
    multcount = 16 (on)
    I/O support = 1 (32-bit)
    unmaskirq = 1 (on)
    using_dma = 1 (on)
    keepsettings = 1 (on)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 5244/16/63, sectors = 71346240, start = 0

    Model=Maxtor 93652U8, FwRev=FA550480, SerialNo=M0000000
    Config={ Fixed }
    RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
    BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=16
    DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
    CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=71346240
    tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
    UDMA modes: mode0 mode1 mode2 mode3 mode4


    /dev/hdd:
    multcount = 16 (on)
    I/O support = 1 (32-bit)
    unmaskirq = 1 (on)
    using_dma = 1 (on)
    keepsettings = 1 (on)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 39560/16/63, sectors = 39876480, start = 0

    Model=Maxtor 92048U8, FwRev=VA510PF0, SerialNo=W805Y9LA
    Config={ Fixed }
    RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
    BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=16
    DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
    CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=39876480
    tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
    UDMA modes: mode0 mode1 mode2 mode3 mode4

    The motherboard I'm using is a Spacewalker/Shuttle HOT-557 v1.5 with
    latest BIOS. This motherboard is 430VX chipset based and is supposed to
    support PIO mode 4/DMA mode 2. It hangs trying to detect the 93652U8,
    so I have it autodetect only hda and let Linux find everything else.

    Now, what I'm seeing is a wide variety of performance results (via hdparm
    -t), depending on where the harddrives are logically placed.

    The following chart will demonstrate, I hope. I'll list by size.

    Config 1:
    hda: 2442: 8.43 MB/sec
    hdb: 12427: 10.13 MB/sec
    hdc: 19470: 6.96 MB/sec
    hdd: 34837: 7.49 MB/sec

    Config 2:
    hda: 2442: 8.43 MB/sec
    hdb: 12427: 10.14 MB/sec
    hdc: 34837: 8.56 MB/sec
    hdd: 19470: 6.69 MB/sec

    Config 3:
    hda: 2442: 8.43 MB/sec
    hdb: 34837: 8.48 MB/sec
    hdc: 12427: 10.19 MB/sec
    hdd: 19470: 6.72 MB/sec

    Config 4:
    hda: 2442: 8.43 MB/sec
    hdb: 34837: 8.50 MB/sec
    hdc: 19470: 6.96 MB/sec
    hdd: 12427: 7.49 MB/sec

    To be honest, almost no tweaking of hdparm really makes a difference,
    except to change PIO modes down to something below 4, which slows things
    down, of course.

    Also, I'm somewhat regularly getting:
    hdd: irq timeout: status=0xd0 { Busy }
    ide1: reset: success

    Same on hdc.

    I've swapped cables, moved power connectors around, etc. I've seen similar
    performance issues before I got the 34837 drive and was using a 3G IBM. I
    figured I'd try all the same brand and see what that did.

    If I move the 19470 drive to hdb, all hell breaks loose. Lots of drive not
    ready/seek type errors just doing a "du -s". Didn't explore other things
    too much at that point; I felt I was going to lose my file systems if I
    wasn't careful, and I just didn't want to deal with that at this point.

    So, is the performance issue I'm seeing with the 19470 drive due to it
    getting ready to go out on me? Is this a piece of crap motherboard (hey, I
    got it for free, so no complaints)?

    Also, when booting, and it says:
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio

    With this motherboard and these drives, should I expect to see DMA in there
    anywhere instead of pio? I thought I had all of the correct tuning options
    turned on in the kernel. But since those say BIOS settings, and BIOS
    really doesn't even know about the other drives, I'm wouldn't be too
    surprised.

    Thanks,
    mrc
    --
    Mike Castle Life is like a clock: You can work constantly
    dalgoda@ix.netcom.com and be right all the time, or not work at all
    www.netcom.com/~dalgoda/ and be right at least twice a day. -- mrc
    We are all of us living in the shadow of Manhattan. -- Watchmen

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