Re: cat /dev/hdb > /dev/null DoS

[Sven Köhler]

> i guess you have DMA enabled on /dev/hdb. I would expect, that the 
> system is at least 50% idle

i did
  dd if=/dev/hda of=/dev/null bs=1M
and noticed, that top shows 0% idle, but 95% wa - what ever that means.

Since i've got DMA turned on, i would expect the CPU to be 95% idle, 
instead 95% wa? what does "wa" stand for?

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