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rt-tests: hwlat.txt: smidetect renamed to hwlatdetect 

- smidetect was long ago renamed to hwlatdetct, reflect this in hwlat.txt
- Fix a few spelling mistakes, and add a missing option

Signed-off-by: John Kacur <jkacur@redhat.com>
This commit is contained in:
John Kacur 2016-05-13 15:24:39 +02:00
parent 4594d66e78
commit 02d36d03fa
1 changed files with 9 additions and 8 deletions
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17
src/hwlatdetect/hwlat.txt
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@ -45,7 +45,7 @@ latency_threshold_us - minimum latency value to be considered (usecs)
max_sample_us - maximum SMI latency spike observed (usecs)
ms_between_samples - interval between samples (ms)
ms_per_sample - sampling time (ms)
sample_us - last sample (usecs). Continously updated, may be used
sample_us - last sample (usecs). continuously updated, may be used
to plot graphs or to create histograms
smi_count - how many latency spikes have been observed
@ -76,7 +76,7 @@ samples during 5ms every 50ms:
# cat ms_per_sample
5
After a while, data may be verified to atest the existence of SMI induced
After a while, data may be verified to test the existence of SMI induced
latencies:
# cat smi_count
@ -88,19 +88,19 @@ latencies:
Depending on the latencies observed it is important to better adjust the
sampling intervals to obtain more accurate measurements. Care must be taken
to not create a continous sampling situation, that might be perceived by the
to not create a continuous sampling situation, that might be perceived by the
kernel as a deadlock.
Python Script
-------------
A python script is provided in in the kernel scripts directory named
'smidetect'. This script handles mounting/unmounting the debugfs,
'hwlatdetect'. This script handles mounting/unmounting the debugfs,
loading/unloading the hwlat module, setting various parameters
for the SMI detector and then starting and stopping the detection. The
smidetect script handles the following arguments:
hwlatdetect script handles the following arguments:
Usage: smidetect [options]
Usage: hwlatdetect [options]
Options:
-h, --help show this help message and exit
@ -114,12 +114,13 @@ Options:
--cleanup force unload of module and umount of debugfs
--debug turn on debugging prints
--quiet turn off all screen output
--watch print sample data to stdout as it arrives
An example run looks like this:
$ sudo scripts/smidetect --duration=1m --report=smi.txt
smidetect: test duration 60 seconds
$ sudo hwlatdetect --duration=1m --report=smi.txt
hwlatdetect: test duration 60 seconds
parameters:
Latency threshold: 100us
Non-sampling gap: 5ms