Re: help: 2.4.0 kernel and /dev/shm
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A long time ago, in a galaxy far, far way, someone said...
> I'm trying out the new 2.4 kernel on my Potato box. I upgrade
> modutils to the version currently in Woody (2.4.1). Works real nice
> except for a slight problem I ran into. I can't mount the System V IP
> shared memory on /dev/shm at bootup. I get this error message:
> shmem fs invalid option
> mount: wrong fs type, bad option, bad superblock or none,
> or too many mounted file systems
> I said YES to 'General setup'->'System V IPC' and NO to 'File
> systems'->'/dev file system support' when running 'make menuconfig'
> I added this line to /etc/fstab as the
> linux-2.4.0/Documentation/Changes says to:
> none /dev/shm shm defaults 0 0
Well my workstation says:
shm /var/shm shm defaults 0 0
Don't worry about /var/shm vs /dev/shm - it's just a mountpoint and will
work fine either way.
> I created a directory /dev/shm with permissions 755. The 2.4 docs
> don't say to, but didn't say not to. A mistake?
It won't matter - the permissions on /dev/shm will be changed to 1777 by
> The kernel boots and even though it can't mount this virtual filesystem,
> everything else seems to work--so far.
The shm filesystem is needed for stuff that uses shared memory segmets (ie
apache, samba, etc) to work.
> Can't believe how much faster the machine boots and runs compared to
> 2.2.18!! Nice work Linus and all the other kernel developers!!
Yea, I noticed that too. I see you haven't tried to push on it yet.
You'll get blown away by the results of some speed trials with dbench
compared to 2.2.x:) But it seems a bit slow compared to 2.4.0-prerelease.
Maybe it's just me.
> Can someone tell me where I went wrong. I tried searching the 'net
> for a clue to no avail. I'm sure it's something stupidly simple I'm
> overlooking. Can anyone point it out? Thanks for the help.
Phil Brutsche email@example.com
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