ivampiresp/Spdk
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

histograms: add doc for bdev histograms

Browse Source 
Signed-off-by: Piotr Pelplinski <piotr.pelplinski@intel.com>
Change-Id: Ie042df61e6fbae583cffb5022d3e26ca078f67fb

Reviewed-on: https://review.gerrithub.io/c/442558
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Piotr Pelplinski 2019-01-29 13:52:21 +01:00 committed by Jim Harris
parent 67c3074b90
commit 891bf99aaa
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
doc/bdev.md
View File

@ -81,6 +81,27 @@ specified. When both rate limits are enabled, the first met limit will
take effect. The value 0 may be specified to disable the corresponding rate
limit. Users can run this command with `-h` or `--help` for more information.
## Histograms {#rpc_bdev_histogram}
The `enable_bdev_histogram` RPC command allows to enable or disable gathering
latency data for specified bdev. Histogram can be downloaded by the user by
calling `get_bdev_histogram` and parsed using scripts/histogram.py script.
Example command
`rpc.py enable_bdev_histogram Nvme0n1 --enable`
The command will enable gathering data for histogram on Nvme0n1 device.
`rpc.py get_bdev_histogram Nvme0n1 | histogram.py`
The command will download gathered histogram data. The script will parse
the data and show table containing IO count for latency ranges.
`rpc.py enable_bdev_histogram Nvme0n1 --disable`
The command will disable histogram on Nvme0n1 device.
## delete_bdev {#bdev_ug_delete_bdev}
To remove previously created bdev user can use `delete_bdev` RPC command.