devf-generic - what is it
Alexander Popov
I'm pretty much lame with QNX - sorry...
I'm using a 206MHz PPC405 based board with qnx 6.2 and the flash is accessed trough the generic fs
(devf-generic). So my question is:
Is it a compressed filesystem?
Is it a journaling fs?
If yes - how heavy is the CPU load for compression/joyrnaling?
Can this be a performance problem on the 206MHz power pc?
Where can I find some more detailed info on the qnx and flash filesystems coming with the neutrino
kernel?
Best Regards,
--
Alexander Popov ProSyst Bulgaria Inc.
Team Leader 48 Vladajska Str.
Dept: Real Time OS and Java VM Sofia 1606, Bulgaria
Phone: +359 2 952 35 81/203 http://www.prosyst.com
Mobile: +359 87 663 193 OSGi Technology Leaders
David Gibbs
> Hi all,
> I'm pretty much lame with QNX - sorry...
> I'm using a 206MHz PPC405 based board with qnx 6.2 and the
> flash is accessed trough the generic fs
> (devf-generic). So my question is:
> Is it a compressed filesystem?
Yes and no. Compressed files will be transparently de-compressed,
but compression won't be done on writes.
> Is it a journaling fs?
No.
> If yes - how heavy is the CPU load for compression/joyrnaling?
No load for journalling. No load for compression (not done).
Decompression is relatively cheap.
> Can this be a performance problem on the 206MHz power pc?
Generally not an issue.
> Where can I find some more detailed info on the qnx and flash
> filesystems coming with the neutrino kernel?
QNX (online) documentation -- System Architecture guide is a good place
to start on QNX overall.
-David
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