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docs: admin-guide: fix printk_ratelimit explanation

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The printk_ratelimit value accepts seconds, not jiffies (though it is
converted into jiffies internally). Update documentation to reflect
this.

Also, remove the statement about allowing 1 message in 5 seconds since
bursts up to 10 messages are allowed by default.

Finally, while we are here, mention default value for
printk_ratelimit_burst too.

Signed-off-by: Oleksandr Natalenko <oleksandr@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Oleksandr Natalenko 2019-10-02 13:46:10 +02:00 committed by Jonathan Corbet
parent ea882f7576
commit ca30ad857d
1 changed files with 4 additions and 2 deletions
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6
Documentation/admin-guide/sysctl/kernel.rst
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@ -831,8 +831,8 @@ printk_ratelimit:
=================
Some warning messages are rate limited. printk_ratelimit specifies
the minimum length of time between these messages (in jiffies), by
default we allow one every 5 seconds.
the minimum length of time between these messages (in seconds).
The default value is 5 seconds.
A value of 0 will disable rate limiting.
@ -845,6 +845,8 @@ seconds, we do allow a burst of messages to pass through.
printk_ratelimit_burst specifies the number of messages we can
send before ratelimiting kicks in.
The default value is 10 messages.
printk_devkmsg:
===============