WHQL & Low Resource Simulation

"QuasiCodo" <no_spam_BillAlexander@Yahoo.com> wrote:

>
>I was under the impression that in order to WHQL certify a driver you have
>to pass Verifier with Low Resource Simulation turned on.

No. Your device is not actually expected to operate under simulated low
resource conditions. The Low Resource Simulation is simply designed to
check whether you abort cleanly under those conditions.

Some people have responded to the low resource simulation by retrying all
of their allocations until they succeed. Allow this does allow your device
to operate under verifier's simulation, that's not the point of the test.
The point is to make sure that you test the result of ExAllocatePool, and
clean up and return a reasonable error when it fails.
--
- Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc

> Some people have responded to the low resource simulation by retrying all

> of their allocations until they succeed. Allow this does allow your

device

> to operate under verifier's simulation, that's not the point of the test.
> The point is to make sure that you test the result of ExAllocatePool, and
> clean up and return a reasonable error when it fails.

It's actually much more than that IMHO. It seems most drivers I run across
do not allocate resources in a resource variable friendly manner. That is
to say, yes you can just fail an allocation and return an appropriate
status, and have your device bang out in Device Manager or fail a request or
what have you for the given situation. But, how much better would it be, if
you architected your driver to not need to do the allocation at the fail
point. It seems that most resources can and should be allocated up front
such that run time failures are minimized. I think low resource simulation
can help point out these areas as well.

--
Bill McKenzie
Software Engineer - Prism 802.11 Wireless Solutions
Conexant Systems, Inc.


"Tim Roberts" <timr@probo.com> wrote in message
news:t643n0t3fgadle6kggir073t5vmusqpvpq@4ax.com...

> "QuasiCodo" <no_spam_BillAlexander@Yahoo.com> wrote:

> >
> >I was under the impression that in order to WHQL certify a driver you

have

> >to pass Verifier with Low Resource Simulation turned on.

>
> No. Your device is not actually expected to operate under simulated low
> resource conditions. The Low Resource Simulation is simply designed to
> check whether you abort cleanly under those conditions.
>
> Some people have responded to the low resource simulation by retrying all
> of their allocations until they succeed. Allow this does allow your

device

> to operate under verifier's simulation, that's not the point of the test.
> The point is to make sure that you test the result of ExAllocatePool, and
> clean up and return a reasonable error when it fails.
> --
> - Tim Roberts, timr@probo.com
> Providenza & Boekelheide, Inc