Date: Thu, 10 Feb 2005 18:43:02 +0100 From: Robert Millan <rmh@debian.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/77353: grow SysV IPC kernel limits Message-ID: <E1CzILG-0007uH-MH@khazad.dyndns.org> Resent-Message-ID: <200502101750.j1AHoHOv036875@freefall.freebsd.org>
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>Number: 77353
>Category: kern
>Synopsis: grow SysV IPC kernel limits
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Feb 10 17:50:14 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Robert Millan
>Release: GNU/kFreeBSD 5.3-3 i686
>Organization:
Debian
>Environment:
System: GNU/kFreeBSD aragorn 5.3-3 #0: Thu Feb 10 15:39:57 CET 2005 i686 GNU/KFreeBSD
postgresql documentation encourages to grow SysV IPC limits on *BSD systems.
I have verified that the GENERIC limits on SysV IPC are too low to be able to
run postgresql. Please adjust them as the documentation recommends:
<quote>
The options SYSVSHM and SYSVSEM need to be enabled when the kernel is compil
ed. (They are by default.) The maximum size of shared memory is determined by th
e option SHMMAXPGS (in pages). The following shows an example of how to set the
various parameters:
options SYSVSHM
options SHMMAXPGS=4096
options SHMSEG=256
options SYSVSEM
options SEMMNI=256
options SEMMNS=512
options SEMMNU=256
options SEMMAP=256
(On NetBSD and OpenBSD the key word is actually option singular.)
You might also want to configure your kernel to lock shared memory into RAM
and prevent it from being paged out to swap. Use the sysctl setting kern.ipc.shm
_use_phys.
</quote>
>Description:
>How-To-Repeat:
>Fix:
--- src/sys/i386/conf/GENERIC~ 2005-02-01 21:44:25.000000000 +0100
+++ src/sys/i386/conf/GENERIC 2005-02-01 21:47:12.000000000 +0100
@@ -49,8 +49,14 @@
options SCSI_DELAY=15000 # Delay (in ms) before probing SCSI
options KTRACE # ktrace(1) support
options SYSVSHM # SYSV-style shared memory
+options SHMMAXPGS=4096
+options SHMSEG=256
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
+options SEMMNI=256
+options SEMMNS=512
+options SEMMNU=256
+options SEMMAP=256
options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extension
s
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options AHC_REG_PRETTY_PRINT # Print register bitfields in debug
>Release-Note:
>Audit-Trail:
>Unformatted:
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