What are the ideal ranges for kern.ipc.shm*?

Chris H bsd-lists at 1command.com
Fri Jul 12 13:40:27 UTC 2013

Greetings Alberto, and thank you for the reply.
> On Fri, Jul 12, 2013 at 5:24 AM, Chris H <bsd-lists at 1command.com> wrote:
>> Greetings,
>>  Over the years using the xfce4 desktop, I would occasionally receive
>> SHM ERROR messages. As they never interfered (so's I could notice), I
>> always put off attempting to track the cause down. However, now having
>> performed a fairly major upgrade (~1yr since last), The error appears
>> to greatly affect KDE4 (used to use kde3) applications I run within
>> xfce4. The windows don't re-draw correctly, and I receive additional
>> errors,as well:
>> ...
>> Resource id:  0x0
>> X Error: BadDrawable (invalid Pixmap or Window parameter) 9
>>   Major opcode: 62 (X_CopyArea)
>>   Resource id:  0x0
>> ...
>> After much searching, it would appear to be related to the
>> kern.ipc.shm* values.
> $ cat /usr/ports/x11-toolkits/qt4-gui/pkg-message
> Qt paint engine makes common use of shared memory. To avoid MIT-SHM
> errors (i.e., blank windows), you probably need to raise shared memory
> limits in loader.conf(5). The following should be safe values for the
> KDE Plasma Desktop:
> kern.ipc.shmall=32768
> kern.ipc.shmmni=1024
> kern.ipc.shmseg=1024

Yes, I followed those instructions when I received the message after the
upgrade from qt3 --> qt4. Entering those numbers in loader.conf(5) caused
the server to freeze and re-boot ~20 seconds after starting X.

> --
> Alberto Villa, FreeBSD committer <avilla at FreeBSD.org>
> http://people.FreeBSD.org/~avilla
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