Some info for hal_ppmc running on an HP dc7800 SFF computer
(ebay bargain) tested with debian 7.6 using rtai and rt-preempt kernels:
rt-preempt kernel (and uspace):
lsb_release -sa: Debian Debian GNU/Linux 7.6 (wheezy) 7.6 wheezy
cmdline: BOOT_IMAGE=/vmlinuz-3.2.0-4-rt-686-pae
root=UUID=30c2aede-6cd4-4da0-842f-a710bde250c6 ro
model name: Intel(R) Pentium(R) Dual CPU E2180 @ 2.00GHz
cores: 2
cpu MHz: 2000.000
rtai kernel (with isolcpus=1):
lsb_release -sa: Debian Debian GNU/Linux 7.6 (wheezy) 7.6 wheezy
cmdline: BOOT_IMAGE=/vmlinuz-3.4-9-rtai-686-pae
root=UUID=30c2aede-6cd4-4da0-842f-a710bde250c6 ro isolcpus=1
model name: Intel(R) Pentium(R) Dual CPU E2180 @ 2.00GHz
cores: 2
cpu MHz: 1994.919
In each case, linuxcnc was built from today's git master (last commit is
59f18d0)
hal_ppmc read/write timing:
http://www.panix.com/~dgarrett/stuff/rtai_ppmc.png
http://www.panix.com/~dgarrett/stuff/rt_preempt_hal_ppmc.png
system latency histogram (jitter) for a 1mS thread:
http://www.panix.com/~dgarrett/stuff/rtai.png
http://www.panix.com/~dgarrett/stuff/rt-preempt.png
--
Dewey Garrett
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