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* [Bug 60991] New: Formula of CommitLimit is wrong
@ 2013-09-08 16:37 bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
       [not found] ` <bug-60991-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
  0 siblings, 1 reply; 13+ messages in thread
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r @ 2013-09-08 16:37 UTC (permalink / raw)
  To: linux-man-u79uwXL29TY76Z2rM5mHXA

https://bugzilla.kernel.org/show_bug.cgi?id=60991

            Bug ID: 60991
           Summary: Formula of CommitLimit is wrong
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
          Reporter: sworddragon2-YDxpq3io04c@public.gmane.org
        Regression: No

The documentation on
https://www.kernel.org/doc/Documentation/filesystems/proc.txt says: "The
CommitLimit is calculated with the following formula:
              CommitLimit = ('vm.overcommit_ratio' * Physical RAM) + Swap"

Variables on my system:
vm.overcommit_ratio = 50
Physical RAM = 16 GiB
SwapTotal = 16776188 KiB

/proc/meminfo says "CommitLimit:    24993316 kB". Now lets see if this is
correct: CommitLimit = (50 * 16777216 KiB) + 16776188 KiB; CommitLimit =
855636988 KiB. The result from the formula does not match with the value
reported by the kernel.

It is more likely that 'vm.overcommit_ratio' must be devided by 100 and
"Physical RAM" must be replaced by the available memory (reported on my system
as "MemTotal:       16434260 kB"). The new formula looks this: CommitLimit =
('vm.overcommit_ratio' / 100 * 'MemTotal') + 'SwapTotal'. The result will be:
CommitLimit = (50 / 100 * 16434260 KiB) + 16776188 KiB; CommitLimit = 24993318
KiB. There is a difference of 2 KiB to the reported value but maybe this comes
from internal rounding.

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^ permalink raw reply	[flat|nested] 13+ messages in thread
end of thread, other threads:[~2016-03-24 15:43 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-09-08 16:37 [Bug 60991] New: Formula of CommitLimit is wrong bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
     [not found] ` <bug-60991-11311-3bo0kxnWaOQUvHkbgXJLS5sdmw4N0Rt+2LY78lusg7I@public.gmane.org/>
2013-11-13 15:12   ` [Bug 60991] [TRIVIAL]Formula " bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2013-12-30  7:23   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-28  4:51   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-28 13:05   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-28 23:04   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-29  5:28   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-29 19:58   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-05-30 12:58   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-06-02  6:52   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2014-06-06  5:41   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2016-03-21 12:09   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r
2016-03-24 15:43   ` bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r

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