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cgroup: Add io.weight example.

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tastytea 2021-07-17 18:21:36 +02:00
parent f3e5c63f87
commit ffe5c95e7e
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GPG Key ID: CFC39497F1B26E07
1 changed files with 8 additions and 3 deletions
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11
content/posts/cgroup v2 by hand.adoc
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@ -162,7 +162,7 @@ echo "$$" > cgroup.procs
== Controlling Input/Output usage
This control group will limit the write speed to 2
This control group will increase the IO priority and limit the write speed to 2
pass:[<abbr title="Mebibyte, 1024 Kibibyte">MiB</abbr>] a second using the io
controllerfootnote:controllers[]. IO limits are set per device. You need to
specify the major and minor device numbers of the _device_ (not partition) you
@ -174,12 +174,17 @@ want to limit (in my case it is “8:0” for `/dev/sda`). Run `lsblk` or `cat
echo "+io" > cgroup.subtree_control
mkdir testgroup
cd testgroup
echo "default 500" > io.weight
echo "8:0 wbps=$((2 * 1024 * 1024)) rbps=max" > io.max
echo "$$" > cgroup.procs
--------------------------------------------------------------------------------
*io.max* limits bytes per second (_rbps/wbps_) and/or IO operations per
second (_riops/wiops_).
- *io.weight* specifies the relative amount of IO time the cgroup can use in
relation to its siblings and has a range from 1 to 10,000. The priority can
be overridden for individual devices with the major:minor syntax, like “8:0
90”. The default is value is 100.
- *io.max* limits bytes per second (_rbps/wbps_) and/or IO operations per second
(_riops/wiops_).
Try running ``dd if=/dev/zero bs=1M count=100 of=test.img
oflag=direct``footnote:[`oflag=direct` opens the file with the `O_DIRECT` flag,