On 5/14/2015 12:10 PM, Sebastian Andrzej Siewior wrote:
Do you have any cyclictest numbers how much the latency increases on
heavy iio usage? Traditionally the primary handler should be very quick
/ short.
Sebastian
With no other processes running, I got the following results after a couple of
hours on one of our devices:
admin@Xander-roboRIO:~# cyclictest -S -m -p 98
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.01 0.07 0.12 1/176 1473
T: 0 ( 1373) P:98 I:1000 C:6503872 Min: 9 Act: 13 Avg: 13 Max: 51
T: 1 ( 1374) P:98 I:1500 C:4335914 Min: 9 Act: 12 Avg: 13 Max: 49
With a VI reading all default handles (raw, offset, scale, sampling_frequency)
in /sys/bus/iio/devices/iio:device0 constantly in a while loop, I got the
following results after a couple hours on the same device:
admin@Xander-roboRIO:~# cyclictest -S -m -p 98
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 6.93 7.30 7.47 3/182 1530
T: 0 ( 1487) P:98 I:1000 C:4497008 Min: 11 Act: 20 Avg: 21 Max: 69
T: 1 ( 1488) P:98 I:1500 C:2998005 Min: 11 Act: 20 Avg: 22 Max: 59
--
Xander Huff
Staff Software Engineer
National Instruments
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