On Thu, Feb 4, 2010 at 12:50 AM, Peter Zijlstra <pet...@infradead.org> wrote: > On Wed, 2010-02-03 at 15:40 +0100, Peter Zijlstra wrote: >> >> If only they would reset the counter on overflow instead of on record, >> that would solve quite a few issues I imagine. > > So I tried enabling the regular PMC overflow interrupt and reprogramming > the counter from that, but touching the counter seems to destroy the > PEBS assist, so much for that idea. > Yes, you have to leave the INT bit off, otherwise you get an interrupt for each overflow, thus you lose the buffer advantage.
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