Re: IDE drives and unmaskirq

From: Martijn van Oosterhout (kleptog@cupid.suninternet.com)
Date: Sat Apr 22 2000 - 10:26:56 EDT

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bbehm@iname.com wrote:
>
> Martijn van Oosterhout wrote :
>
> > Odd, both my hard disks are UDMA. You're saying unmaskirq has
> > no effect on UDMA systems?
>
> Yes, but are you running them in UDMA?

You tell me:

hda: QUANTUM FIREBALL ST4.3A, 4110B w/81kB Cache, CHS=524/255/63, UDMA
hdb: QUANTUM FIREBALL EX12.7A, 12159MB w/418kB Cache, CHS=1550/255/63,
UDMA

The 12G does at 12.5MB/s.

> " hdparm -d1 -X66 -c1 /dev/hd[.] " for UDMA or
> " hdparm -d1 -X34 -c1 /dev/hd[.] " for DMA

No settings changed anywhere, default kernel settings. Had to fiddle
with
the bios here to make it do that.

> Sometimes, despite your kernel compile parameters, your drives will default
> to PIO4 mode if the controller isn't in 100% native mode (as in my i440BX)
> or somesuch.

440TX i think, PIIX4

-- Martijn van Oosterhout <kleptog@cupid.suninternet.com> http://cupid.suninternet.com/~kleptog/

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