JFFS2 mount time is really bad on 1st boot only

JFFS2 mount time is really bad on 1st boot only

[Stuart Yoder]

We are using JFFS2 in a  Linux 2.4.28 kernel based system (PowerPC based
hw).  We have a large (256MB) flash.

Here is the scenario for some behaviour we are seeing that we are trying
to undertand:

-create Linux root filesystem with mkfs.jffs2-- about 90MB of data.
-flash partition onto board-- ~90MB data, ~140MB free (erased)
-boot Linux
-mount of JFFS2 root partition takes on the order of 8 min
-reboot system from Linux
-mount of JFFS2 root partition takes ~30 sec

All subsequent boots take ~30 sec.

Does anybody have any idea of why the very first mount of the filesystem
takes so long?

Thanks,
Stuart Yoder

Re: JFFS2 mount time is really bad on 1st boot only

[David Woodhouse]

On Wed, 2005-01-12 at 13:47 -0600, Stuart Yoder wrote:
> Does anybody have any idea of why the very first mount of the
> filesystem takes so long?

It's probably erasing the unused part of the file system. Running with
CONFIG_JFFS2_FS_DEBUG=1 should fix that. 

Running a current (i.e. 2.6) kernel should make the subsequent mounts a
lot faster too.

-- 
dwmw2

Re: JFFS2 mount time is really bad on 1st boot only

[David Woodhouse]

On Wed, 2005-01-12 at 20:02 +0000, David Woodhouse wrote:
> It's probably erasing the unused part of the file system. Running with
> CONFIG_JFFS2_FS_DEBUG=1 should fix that. 

Doh.

s/fix that/show you that/

-- 
dwmw2