I don't know about JFFS2 but back in the old days before Linux yuo
could be pretty sure that a Unix filesystem didn't waste space storing
null bytes. Wtmp and other system files (databases?) take advantage
of this.
Now you've made me aware of this I've deleted /var/log/wtmp. I doubt
it was using as much storage as you suggest but if I'd really been
thinking I'd have done a df before and after - maybe someone else
will.
There's no need to link it to anything. If the file isn't there, then
logging is turned off - at least that's what should happen.
Michael
----- Original Message -----
From: "Nils Faerber" <[EMAIL PROTECTED]>
To: <maemo-developers@maemo.org>
Sent: Wednesday, April 12, 2006 3:34 PM
Subject: [maemo-developers] Zapped wtmp...
Hi!
I thought I should let you know...
I am not sure if I really found any cure to anything but after the
latest discussions about the size of wtmp I checked mine on the 770
and
found a more than 200MB file!
After gzip'ping it it shrank to just 5MB because it contains almost
only
0s. But there must be the information for 200MB stored somewhere in
the
JFFS2 so I guess that even if it only has 5MB as a comporessed file
the
impact on a JFFS2 can be much worse.
So I enabled the R&D mode, became root and linked /var/log/wtmp to
/dev/null (who cares for this wtmp on the 770 anyway?).
Before I did this I saw more and more weird phenomena on the device,
like crashing browser and spurious power-offs when case closed
(almost
100% battery, closed device one night, next morning it was powered
off
and had to be rebooted!).
Now after I zapped wtmp I have the feeling (!) that it behaves much
better again! I can browse pages that before did not work and I hope
that the power-downs are history now too (for the last three days
they
are but you never know).
Maybe someone else likes to try to this too and report his/her
experience here.
Probably wtmp should be linked to /dev/null in the next software
release
too.
BTW: With every closure of the case the wtmp grows by about 3kB. You
can
estimate with your usage how big it will get...
Cheers
nils faerber
--
kernel concepts Tel: +49-271-771091-12
Dreisbachstr. 24 Fax: +49-271-771091-19
D-57250 Netphen Mob: +49-176-21024535
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