Re: Linux-2.2.0 bad VM behaviour "dd if=/dev/zero of=/dev/hdc

Petri Mattila (petri@prihateam.fi)
Wed, 27 Jan 1999 19:06:57 +0200

> I guess there is something wrong with the 2.2.0 vm... when I try this:
>
> dd if=/dev/zero of=/dev/hdc bs=256k
>
> the system becomes very lazy...

I guess I found something: this unfortunate behaviour disappears
if I turn off IDE DMA mode. With PIO modes there is hardly any
swapping.

So the conclusion is the bug may be in DMA memory handling ?

Thanks,

Petri

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/