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    SubjectRE: debugctl msr
    >-----Original Message-----
    >From: stephane eranian []
    >Sent: Freitag, 21. November 2008 16:27
    >To: Metzger, Markus T
    >Cc: Markus Metzger; Ingo Molnar; Andi Kleen; Andrew Morton;
    >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.

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