Re: Lookup during intensive IO
On Mon, Sep 17, 2001 at 08:11:09PM -0300, Christoph Simon wrote:
> > On Monday 17 September 2001 11:42 am, Jose Manuel dos Santos Calhariz wrote:
> > >
> > > The hardware of the machine is:
> > > - AMD Atlhon 900 MHz
> > > - 256MB SRAM
> > > - Motherboard is a ASUS A7V with VIA KT133
> > > - A second IDE controler Promise PDC20265
> > > - hda: Maxtor 91152D8, ATA DISK drive 11GB
> > > - hdb: Maxtor 90648D3, ATA DISK drive 6GB UltraDMA33
> > > - hdc: Maxtor 98196H8, ATA DISK drive 80GB UltraDMA33
> > > - Adaptec 2940U
> > > - scd0: Vendor: PLEXTOR Model: CD-R PX-R412C Rev: 1.07
> > > - scd1: Vendor: PLEXTOR Model: CD-ROM PX-20TS Rev: 1.01
> > >
> > > What can I do more to find the cause of the lookups.
>
> AFAIK, Linux kernel have DMA for Via chipsets disabled by default. Did
> you enable them? If so, try building a kernel without it.
>
VP_IDE: IDE controller on PCI bus 00 dev 21
VP_IDE: chipset revision 16
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 vt82c686a (rev 22) IDE UDMA66 controller on pci00:04.1
ide0: BM-DMA at 0xd800-0xd807, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xd808-0xd80f, BIOS settings: hdc:DMA, hdd:pio
Coud this mean, it is enable by default? If the dma is disabled
writes to the harddisk turns the system very slow. That's why
I force it to be enabled.
But I have very little experience with IDE hardisk. Any help is very
good.
>
> --
> Christoph Simon
> datageo@terra.com.br
> ---
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