On 05/09/2013 03:08:16 PM, Walter Dnes wrote:
On Thu, May 09, 2013 at 12:26:34PM +0200, Harald Becker wrote
> Hi Walter !
>
> > Yesterday, it started blowing up on me. After painfull
debugging, I
> > discovered that /dev/shm now only 10 megabytes.
>
> Did you change your kernel and or other system start information?
>
> tmpfs has a mount option to specify the maximum size. As /dev/shm is
> usually for small shared memory regions (POSIX) it gets limited to
> smaller size than 50% of available RAM.
>
> Try 'mount -oremount,size=100M /dev/shm' ... but this is all not
> Busybox related.
That was almost, but not quite, the correct answer. More spelunking
shows that there is no built-in limit for /dev/shm per se. However,
/dev/shm is mounted on top of /dev.
And /etc/mtab showed...
mdev /dev tmpfs rw,nosuid,relatime,size=10240k,mode=755 0 0
On a physical disk, you can't allocate a 1 gig mount on a 10
megabyte
partition. Similarly, you can't mount allocate a 1 gig /dev/shm on
top
of a 10 meg /dev. So the solution was to...
mount -oremount,size=500M /dev
If it really is a separate mount point, then that's a kernel bug. (If
it's just a subdirectory, that's not. If they mounted a new /dev over
/dev/shm then the undermount would be hidden...)
Do "df /dev" and "df /dev/shm" give different mount points?
Rob
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