On 07/13/2004 02:29 PM Philippe Gerum wrote: > On Wed, 2004-07-07 at 13:37, Wolfgang Grandegger wrote: >> Hi, >> >> I have now commited a first port of RTAI over ADEOS/ppc to the vesuvio >> branch. One first observation is, that the latencies and task switch >> times are almost doubled on slow PowerPC processors (MPC860 at 50 MHz). > >> I will give some more information on this port including performance >> figures later on. >> > > It would be interesting to know if the IRQ latencies are also observable > using the irq_jitter test (or some adaptation of) from the Adeos distro > (linux/examples/* IIRC).
These figures look resonable but I cannot compare them directly with the pre-ADEOS case. From my point of view, the bigger task switch times and latencies are simply due to additional code to be processed, which shows up on slow processors (with little caches, etc.). Are there any figures for x86? I will provide some preliminary ones for PPC today or tomorrow. Thanks. Wolfgang.
