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mq_overview.7: Update details on defaults and ceiling for 'msgsize_max' limit 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2013-03-17 15:10:43 +01:00
parent 2d5cee6b4e
commit 81020547cb
1 changed files with 13 additions and 4 deletions
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@ -184,11 +184,20 @@ is 8192 bytes.
The minimum value is 128 (8192 in kernels before 2.6.28). The minimum value is 128 (8192 in kernels before 2.6.28).
The upper limit for The upper limit for
.I msgsize_max .I msgsize_max
is 1,048,576 (in kernels before 2.6.28, the upper limit was has varied across kernel versions:
before Linux 2.6.28, the upper limit was
.BR INT_MAX ; .BR INT_MAX ;
that is, 2,147,483,647 on Linux/86). (that is, 2,147,483,647 on Linux/86);
This limit is ignored for privileged processes starting with Linux 2.6.38, the limit was 1,048,576;
.RB ( CAP_SYS_RESOURCE ). since Linux 3.5, the limit is 16,777,216
.RB ( HARD_MSGSIZEMAX ).
The
.I msgsize_max
limit is ignored for privileged process
.RB ( CAP_SYS_RESOURCE ),
but, since Linux 3.5, the
.BR HARD_MSGSIZEMAX
ceiling is enforced for privileged processes.
.TP .TP
.I /proc/sys/fs/mqueue/queues_max .I /proc/sys/fs/mqueue/queues_max
This file can be used to view and change the system-wide limit on the This file can be used to view and change the system-wide limit on the