RE: debugctl msr

[Metzger, Markus T]

>-----Original Message-----
>From: stephane eranian [mailto:eranian@xxxxxxxxxxxxxx] 
>Sent: Freitag, 21. November 2008 16:27
>To: Metzger, Markus T
>Cc: Markus Metzger; Ingo Molnar; Andi Kleen; Andrew Morton; 
>linux-kernel@xxxxxxxxxxxxxxx
>Subject: Re: debugctl msr

>The absolute maximum MUST be at buffer+size+1 but the 
>threshold can be anywhere
>between the start of the buffer and buffer+size. You had it set past
>the end of the buffer (at +1),
>therefore PEBS was not generating any interrupts.

The default is cyclic mode, which requires the interrupt threshold
to be outside of the buffer.

A request for interrupt mode should have got you -EOPNOTSUPP.

Absolute max should be one byte beyond the buffer, which
is base + size.


regards,
markus.
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