Gentoo Archives: gentoo-user

From: Alan McKinnon <alan.mckinnon@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Setting size of /dev/shm or cleaning up ancient /etc/fstab
Date: Wed, 08 May 2013 06:44:13
Message-Id: 5189F429.4020302@gmail.com
In Reply to: [gentoo-user] Setting size of /dev/shm or cleaning up ancient /etc/fstab by Walter Dnes
1 On 08/05/2013 07:55, Walter Dnes wrote:
2 > I'm running mdev, so that may be related. Here's my story... a script
3 > I run to automatically process digital photos started blowing up on me.
4 > After much bashing of head against brick wall, I determined that
5 > /dev/shm now has an absolute max size of 10 megabytes! Any larger files
6 > could not be written to it. Here's all the uncommented stuff in /etc/fstab
7 >
8 >
9 > /dev/sda5 / ext2 noatime,nodiratime,async 0 1
10 > /dev/sda7 /home reiserfs noatime,nodiratime,async,notail 0 1
11 > /home/bindmounts/opt /opt auto bind 0 0
12 > /home/bindmounts/var /var auto bind 0 0
13 > /home/bindmounts/usr /usr auto bind 0 0
14 > /home/bindmounts/tmp /tmp auto bind 0 0
15 > /dev/sda6 none swap sw 0 0
16 > /dev/cdrom /mnt/cdrom iso9660 noauto,users,ro 0 0
17 > /dev/sr0 /mnt/dvd auto noauto,users,ro 0 0
18 > devpts /dev/pts devpts defaults 0 0
19 > none /dev/shm tmpfs rw,noatime,noexec,nosuid,nodev 0 0
20 >
21 > Meanwhile, my netbook, with the /dev/shm line commented out, runs just
22 > fine and handles large files in /dev/shm. I followed the example at
23 > http://wiki.gentoo.org/wiki/Complete_Handbook/Configuring_the_system
24 > with slightly more paranoid settings, e.g. noexec. What gives?
25 >
26
27
28 a tmpfs defaults to half ram size. If yours is 10M, then quite obviously
29 you run some code somewhere that does it different :-)
30
31 You could go through the effort of tracking down why. Unless this is a
32 default behaviour of mdev which needs debugging, pathcing and fixing, I
33 don't think you should spend any brain cycles on this, just add this to
34 the mount options
35
36 size=50%
37
38 --
39 Alan McKinnon
40 alan.mckinnon@×××××.com

Replies

Subject Author
[gentoo-user] [SOLVED] Setting size of /dev/shm or cleaning up ancient /etc/fstab Walter Dnes <waltdnes@××××××××.org>