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On Wed, May 8, 2013 at 12:55 AM, Walter Dnes <waltdnes@××××××××.org> wrote: |
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> I'm running mdev, so that may be related. Here's my story... a script |
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> I run to automatically process digital photos started blowing up on me. |
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> After much bashing of head against brick wall, I determined that |
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> /dev/shm now has an absolute max size of 10 megabytes! Any larger files |
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> could not be written to it. Here's all the uncommented stuff in /etc/fstab |
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> |
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> |
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> /dev/sda5 / ext2 noatime,nodiratime,async 0 1 |
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> /dev/sda7 /home reiserfs noatime,nodiratime,async,notail 0 1 |
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> /home/bindmounts/opt /opt auto bind 0 0 |
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> /home/bindmounts/var /var auto bind 0 0 |
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> /home/bindmounts/usr /usr auto bind 0 0 |
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> /home/bindmounts/tmp /tmp auto bind 0 0 |
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> /dev/sda6 none swap sw 0 0 |
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> /dev/cdrom /mnt/cdrom iso9660 noauto,users,ro 0 0 |
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> /dev/sr0 /mnt/dvd auto noauto,users,ro 0 0 |
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> devpts /dev/pts devpts defaults 0 0 |
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> none /dev/shm tmpfs rw,noatime,noexec,nosuid,nodev 0 0 |
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> |
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> Meanwhile, my netbook, with the /dev/shm line commented out, runs just |
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> fine and handles large files in /dev/shm. I followed the example at |
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> http://wiki.gentoo.org/wiki/Complete_Handbook/Configuring_the_system |
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> with slightly more paranoid settings, e.g. noexec. What gives? |
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You can forcefully specify the size of /dev/shm like this: |
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none /dev/shm tmpfs defaults,size=10G 0 0 |
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But it should default to 50% of your system RAM... weird... do you |
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have any local scripts that are remounting it, maybe? |
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There's a lot more information in the kernel documentation: |
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/usr/src/linux//Documentation/filesystems/tmpfs.txt |
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The default fstab from latest baselayout does not contain /dev/shm at all: |
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# /etc/fstab: static file system information. |
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# |
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# noatime turns off atimes for increased performance (atimes normally aren't |
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# needed); notail increases performance of ReiserFS (at the expense of storage |
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# efficiency). It's safe to drop the noatime options if you want and to |
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# switch between notail / tail freely. |
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# |
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# The root filesystem should have a pass number of either 0 or 1. |
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# All other filesystems should have a pass number of 0 or greater than 1. |
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# |
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# See the manpage fstab(5) for more information. |
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# |
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|
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# <fs> <mountpoint> <type> <opts> |
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<dump/pass> |
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# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts. |
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/dev/BOOT /boot ext2 noauto,noatime 1 2 |
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/dev/ROOT / ext3 noatime 0 1 |
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/dev/SWAP none swap sw 0 0 |
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/dev/cdrom /mnt/cdrom auto noauto,ro 0 0 |
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/dev/fd0 /mnt/floppy auto noauto 0 0 |
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