On Thu, 2010-02-04 at 00:51 +0100, Stephane Eranian wrote: > 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.
Well sure, but that's not the point. I was thinking that if we need to do single event pebs anyway, we might as well try to reprogram on the PMC overflow interrupt instead of on the PEBS overflow and curb some of that drift. Also, it makes keeping the event count value a lot easier. But alas. ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
