> I've tried to use Mr. Gearheart's patch for Kernel 2.4.18 and > rtlinux-3.1, found on ftp.fsmlabs.com/pub/rtlinux/contrib/gearheart/. > Mostly it went smooth, but I've found strange behaviour. I would like to > get some information about this. > > I've used NI's 8176(PentiumIII-S 1.26GHz, 128MByte) SBC for PXI > (CompactPCI + PXI extention) system. > > Kernel 2.4.18 + rtl3.1 with above patch shows 400 to 500 microsec > latency, which is unexpectedly large, with examples/measurement > test-program. > > Kernel 2.4.4 + rtl3.0 on the same machine gives acceptable value, well > below 10 microsec (1.5 most of the time, 5 to 6 sometimes). > could you enable the tracer and run tracer/rt_process on both 2.4.4 and 2.4.18 and report what it shows.
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