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"Ira W. Snyder" <iws@ovro.caltech.edu> hat am 20. April 2011 um 22:44 geschrieben:<br/>
<br/>
> On Wed, Apr 20, 2011 at 09:21:00PM +0200, Schwarz,Andre wrote:<br/>
> > Hi,<br/>
> ><br/>
> > I'm facing an issue with tmpfs mounts on PowerPC (mpc83xx specifically).<br/>
> ><br/>
> > After "mount -t tmpfs tmpfs /tmp -o size=16m" I can fill the machine's mem<br/>
> > (512MiB) until oom becomes active.<br/>
> ><br/>
> > I can't see this on any other machine (x86/ARM) I have access to.<br/>
> > There's always a "no space left on device" message as soon as size specified is<br/>
> > reached ...<br/>
> ><br/>
> > kernel versions available are v2.6.26.27 and v2.6.34.7 showing the same<br/>
> > behaviour.<br/>
> ><br/>
> > I'd expect the kernel to limit available tmpfs size to 50% of physical memory<br/>
> > anyway.<br/>
> ><br/>
> > Any ideas what might be wrong ?<br/>
> ><br/>
><br/>
> For what it is worth, I tried this on an 8349EA board, using 2.6.38rc8.<br/>
> It behaved exactly as I would expect. A short log is below. Maybe your<br/>
> mount command parses options differently on the powerpc machine?
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<p style="margin: 0px;"> </p>
<p style="margin: 0px;">even with incorrect/missing mount options the kernel should limit the size</p>
<p style="margin: 0px;">to 50% phys mem ... at least according to doc/tmpfs.txt </p>
<p style="margin: 0px;"> </p>
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> Try it with the mount options before the mount points?
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<p style="margin: 0px;"> </p>
<p style="margin: 0px;">no effect.</p>
<p style="margin: 0px;"> </p>
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><br/>
> iws@carmaboard7 ~ $ mkdir mnt<br/>
> mkdir: cannot create directory `mnt': File exists<br/>
> iws@carmaboard7 ~ $ ls mnt/<br/>
> iws@carmaboard7 ~ $ sudo mount -t tmpfs -o size=16m,users none mnt<br/>
> iws@carmaboard7 ~ $ ls mnt/<br/>
> iws@carmaboard7 ~ $ mount | grep mnt<br/>
> none on /home/iws/mnt type tmpfs (rw,nosuid,nodev,noexec,relatime,size=16384k)<br/>
> iws@carmaboard7 ~ $ cd ^C<br/>
> iws@carmaboard7 ~ $ dd if=/dev/zero of=mnt/file.bin bs=1M count=18<br/>
> dd: writing `mnt/file.bin': No space left on device<br/>
> 16+0 records in<br/>
> 15+0 records out<br/>
> 16760832 bytes (17 MB) copied, 0.313836 s, 53.4 MB/s<br/>
> iws@carmaboard7 ~ $ du -b mnt/file.bin<br/>
> 16760832 mnt/file.bin<br/>
> iws@carmaboard7 ~ $ df -h mnt<br/>
> Filesystem Size Used Avail Use% Mounted on<br/>
> none 16M - - - /home/iws/mnt<br/>
> iws@carmaboard7 ~ $ uname -a<br/>
> Linux carmaboard7.correlator.pvt 2.6.38-rc8-00028-g24d6894 #1 Tue Mar 8 09:48:15 PST 2011 ppc e300c1 GNU/Linux<br/>
> iws@carmaboard7 ~ $ cat /proc/cpuinfo<br/>
> processor : 0<br/>
> cpu : e300c1<br/>
> clock : 533.333328MHz<br/>
> revision : 3.1 (pvr 8083 0031)<br/>
> bogomips : 133.29<br/>
> timebase : 66646782<br/>
> platform : MPC834x MDS<br/>
> model : CARMA<br/>
> Memory : 256 MB
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<p style="margin: 0px;"> </p>
<p style="margin: 0px;">yes - this is the expected behaviour I can see on all systems ... except mine :-( </p>
<p style="margin: 0px;"> </p>
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> > Hope it helps,
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<p style="margin: 0px;"> </p>
<p style="margin: 0px;">no - but thank you for trying. </p>
<p style="margin: 0px;"> </p>
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Cheers,
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<p style="margin: 0px;">André </p>
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