For some more often than others :-D ! / Lars
2012/10/16 EBo <[email protected]>: > Lars, > > No bother. We all have those headlapping moments. Actually I had not > even noticed... > > Thanks for the follow up though! > > EBo -- > > On Tue, 16 Oct 2012 14:49:44 +0200, Lars Segerlund wrote: >> I made a bit of a fool of myself asking about the best way to >> implement preempton disabled detection in the kernel, since it's >> already there >> >> I got he name for tracefs and googled, if you have a 'bad' system >> you >> can enable detection as per below: >> >> >> https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-Using_the_ftrace_Utility_for_Tracing_Latencies.html >> http://lwn.net/images/conf/rtlws11/papers/proc/p02.pdf >> >> Together with running hwlat this should give a good indication where >> the preemption latency is coming from, BIOS/hardware or kernel. >> You can also have tracefs trigger on latencies larger than a preset >> value. >> >> / regards, Lars Segerlund. >> >> >> ------------------------------------------------------------------------------ >> Don't let slow site performance ruin your business. Deploy New Relic >> APM >> Deploy New Relic app performance management and know exactly >> what is happening inside your Ruby, Python, PHP, Java, and .NET app >> Try New Relic at no cost today and get our sweet Data Nerd shirt too! >> http://p.sf.net/sfu/newrelic-dev2dev >> _______________________________________________ >> Emc-developers mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-developers > > > ------------------------------------------------------------------------------ > Don't let slow site performance ruin your business. Deploy New Relic APM > Deploy New Relic app performance management and know exactly > what is happening inside your Ruby, Python, PHP, Java, and .NET app > Try New Relic at no cost today and get our sweet Data Nerd shirt too! > http://p.sf.net/sfu/newrelic-dev2dev > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Don't let slow site performance ruin your business. Deploy New Relic APM Deploy New Relic app performance management and know exactly what is happening inside your Ruby, Python, PHP, Java, and .NET app Try New Relic at no cost today and get our sweet Data Nerd shirt too! http://p.sf.net/sfu/newrelic-dev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
