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    SubjectRe: Kernel 2.5.40 DMA and mm issues
    Date
    On Friday 04 October 2002 9:02 am, Andrew Morton wrote:
    > szonyi calin wrote:
    > > ...
    > > Here is /proc/meminfo after killing the updatedb:
    > > MemTotal: 125576 kB
    > > MemFree: 5540 kB
    > > MemShared: 0 kB
    > > Buffers: 21092 kB
    > > Cached: 25124 kB
    > > SwapCached: 1888 kB
    > > Active: 15388 kB
    > > Inactive: 33268 kB
    > > HighTotal: 0 kB
    > > HighFree: 0 kB
    > > LowTotal: 125576 kB
    > > LowFree: 5540 kB
    > > SwapTotal: 248968 kB
    > > SwapFree: 246892 kB
    > > Dirty: 64 kB
    > > Writeback: 0 kB
    > > Mapped: 2512 kB
    > > Slab: 69712 kB
    > > Committed_AS: 3348 kB
    > > PageTables: 192 kB
    > > ReverseMaps: 2314
    >
    > That looks reasonable for an updatedb run.
    >
    > > hda: DMA disabled
    >
    > This is probably why it's taking tons of system time.
    > -

    I get the same 'DMA disabled' messages with 2.5 but DMA is never actually
    disabled so I wouldn't rely on them being accurate (see below)

    Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    VP_IDE: IDE controller at PCI slot 00:11.1
    PCI: Hardcoded IRQ 14 for device 00:11.1
    VP_IDE: chipset revision 6
    VP_IDE: not 100% native mode: will probe irqs later
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    VP_IDE: VIA vt8233a (rev 00) IDE UDMA133 controller on pci00:11.1
    ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:pio
    hda: WDC WD400BB-00CAA0, ATA DISK drive
    hdb: TOSHIBA DVD-ROM SD-M1402, ATAPI CD/DVD-ROM drive
    hda: DMA disabled
    hdb: DMA disabled
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    hdc: LITE-ON LTR-24102B, ATAPI CD/DVD-ROM drive
    hdc: DMA disabled
    ide1 at 0x170-0x177,0x376 on irq 15
    hda: host protected area => 1
    hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63, UDMA(100)
    hda: hda1 hda2 hda3 hda4 < hda5 hda6 >
    -----------------------------------------------------------------------------------------------------------
    gandalf:/home/sandersn# hdparm /dev/hda

    /dev/hda:
    multcount = 0 (off)
    IO_support = 1 (32-bit)
    unmaskirq = 1 (on)
    using_dma = 1 (on)
    keepsettings = 0 (off)
    readonly = 0 (off)
    readahead = 256 (on)
    geometry = 4865/255/63, sectors = 78165360, start = 0
    ------------------------------------------------------------------------------------------------------------
    gandalf:/home/sandersn# hdparm -tT /dev/hda

    /dev/hda:
    Timing buffer-cache reads: 128 MB in 0.43 seconds =299.77 MB/sec
    Timing buffered disk reads: 64 MB in 1.52 seconds = 42.22 MB/sec








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