Re: IDE DMA getting turned off...

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 26 Oct 1999 18:37:10 +0100 (BST)


> Well, we've run into a brand new IDE problem: disk DMA is getting turned off
> mysteriously. Here's one way to reproduce the problem: do a 'hdparm -S 1
> /dev/hdX', wait about a minute then try to write to the disk. The write speed
Mysteriously ?

> hdc: timeout waiting for DMA
> hdc: irq timeout: status=0xd2 { Busy }

It tried DMA, DMA failed

> hdc: DMA disabled
> hdd: DMA disabled

It disabled it

> ide1: reset: success
> Oct 24 08:09:31 fnpc229 kernel: ide1: reset: success

Then it reset the controller in the end

> This is a big deal to us since we require the read/write speed to exceed
> 6MB/sec (and of course it would be nice if it was in the 14-15MB/s range).
>
> Any ideas?

man hdparm (see the -k option)

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