On Mon, 15 Oct 2007, Alan Cox wrote:
>
> For some things. I do it a bit because you can use it to fake
> failures that are tricky to do in the real world. It won't tell you the
> driver works but its suprisingly good for testing for races (forcing IRQ
> delivery at specific points), buggy hardware you don't posess, and things
> like media failures and timeouts your real hardware refuses to do.
Heh. I do agree that you likely find bugs, even if quite often it's
exactly because the behaviour is something that will never happen on real
hardware.
But failure testing is very useful - I forget who it was who debugged some
driver by taking a CD and just scrathing it mercilessly to induce read
errors ;)
Having a really *bad* HW emulator can certainly work that way too, even if
it also would probably end up hitting just a few of the potential error
paths..
Linus
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