03.08.2015 19:44, Clark Williams пишет:
On Mon, 3 Aug 2015 14:13:27 +0300
pavel <pavel@xxxxxxxxxxx> wrote:
# ./cyclictest -S -p fifo
defaulting realtime priority to 9
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.00 0.03 0.05 1/218 4240
T: 0 ( 4174) P: 9 I:1000 C: 430806 Min: 1 Act: 1 Avg: 1 Max: 10
T: 1 ( 4175) P: 9 I:1500 C: 287204 Min: 1 Act: 1 Avg: 1 Max: 6
T: 2 ( 4176) P: 9 I:2000 C: 215403 Min: 1 Act: 2 Avg: 1 Max: 11
T: 3 ( 4177) P: 9 I:2500 C: 172322 Min: 1 Act: 1 Avg: 1 Max: 9
T: 4 ( 4178) P: 9 I:3000 C: 143602 Min: 1 Act: 1 Avg: 1 Max: 10
T: 5 ( 4179) P: 9 I:3500 C: 123087 Min: 1 Act: 1 Avg: 1 Max: 11
T: 6 ( 4180) P: 9 I:4000 C: 107701 Min: 1 Act: 1 Avg: 1 Max: 10
T: 7 ( 4181) P: 9 I:4500 C: 108232 Min: 1 Act: 2 Avg: 1 Max: 11
It possible? 1us latency? o_O
kernel- 3.18.19-rt15
cyclictest V 0.92
Intel(R) Xeon(R) CPU E3-1246 v3 @ 3.50GHz
MSI MS-7823/B85M-G43 (MS-7823), BIOS V3.14B3 06/23/2014
--
No, your latency is 11us. Max latency is what we care about, not the
average.
By the way, max values appear only at the start, then they are roughly equal to
the average.
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