Messages in this thread | | | From | Nick Sanders <> | Subject | Re: Kernel 2.5.40 DMA and mm issues | Date | Fri, 4 Oct 2002 09:51:33 +0100 |
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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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