On Tue, 2007-10-30 at 22:26 +0100, Gerrit Binnenmars wrote: > Daniel, I first applied the rt patchset and then the LTTng patch > (http://ltt.polymtl.ca/lttng/patch-2.6.22.1-rt4-lttng-0.9.10.tar.gz). > Then LTT can be selected in the Instrumentation part of the config file. > further ltt-control is needed (http://ltt.polymtl.ca/lttng/ltt-control-0.43-10082007.tar.gz) > > The viewer is only working on i386 but that is not really a problem. > > So, I applied the available patches without doing anything special. Ok . > Is LTT causing troubles with the preempt_max_latency options? I doubt it .. I haven't used the histogram options in a month or so .. But if I remember correctly the value of preempt_max_latency is suppose to remain at zero .. Usually preempt_max_latency is used to prune off uninteresting latencies (ones under the max) but if you have the histogram option turn on then all latencies points need to be recorded. The data can be viewed in in /proc/latency_hist/ .. In 2.6.22 there is no way to reset the histograms for preempt off, or interrupts off timing. Daniel - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
