-- On Thu, 18 Oct 2007, Gernot Hillier wrote: > Hi! > > We're currently evaluating whether PREEMPT_RT will work for a certain > use case combining realtime and performance requirements running on a > lot of CPUs and using a bunch of RAM. > > For first tests, we're running a "small" AMD64 test system with 2x2 > cores (2 CPUs with 2 cores each) with 8 GB of RAM. > > We wrote a small testcase which basically has one SCHED_FIFO "realtime" > thread which does nothing but sleeping and checking if it wakes up at > the right time. In addition, it spawns 20 low-prio "load threads" > introducing a lot of malloc/memory access/free load on some GB of RAM. > > We can see, that the realtime requirements are fulfilled quite well (if > using the current glibc with private futexes, but that's another story). > The "rt thread" reacts within the expected timeframe with 2.6.22.1-rt9 > as well as with 2.6.23-rt1. > > However, what causes problems is the load balancing of the 20 threads > over the available CPU cores: > The latest 2.6.23-rt3 (as well as -rt2) has new RT balancing code. Could you try that to see if it solves you issues. Thanks, -- Steve - 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
