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SubjectRe: [patch] Re: setitimer lowlatency-2.2.13-A1 questions
On Tue, 7 Dec 1999, William Montgomery wrote:

>
>On Tue, 7 Dec 1999, Andrea Arcangeli wrote:
>> >This allows me to see the irqdis_nobh in my ktrace, however, I never
>> >do see it. [..]
>>
>> That's fine because you must not see it. If you see it it means it should
>> BUG() or you won't be able to achieve the best latency.
>>
>What is BUG()?

BUG() in 2.3.x is a nicer way to say *(int *)0 = 0 (and BUG() probably
will work also if the virtual address zero is mapped to a valid physical
page but that's not an issue for most code).

>Sorry, not anymore. I have new test results and I will provide a plain
>(mostly) ktrace dump. I did not enable CPU info since I am not SMP.

Fine thanks. I'll look into it ASAP.

>Why are the hex addresses interesting?

Because with hex I understand without possible mistakes where the CPU was
running inside do_IRQ. (I don't need the System.map if the trace is long
enough)

>Will enabling CPU info be useful in my case?

No, the trace you sent should be just fine. I didn't known you was UP (and
the CPU info will never harm so I suggested you the safe way ;).

Andrea


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