Re: 2.6.17-ck1: fcache problem...

[Paolo Ornati <ornati@fastwebnet.it>]

On Sun, 25 Jun 2006 12:28:39 +0200
Jens Axboe <axboe@suse.de> wrote:

> > [   26.673525] fcache: found serial 33, expected 34.
> > [   26.673529] fcache: reprime the cache!
> > [   26.673535] ext3: failed to open fcache (err=-22)
> 
> Hmm, and you are sure that the fs is properly umounted on reboot? Or is
> it just remounted ro? It looks like fcache_close_dev() isn't being
> called, so the cache serial doesn't match what we expect from the fs,
> hence fcache bails out since it could indicate that the fs has been
> changed without fcache being attached.

Ahh... it is the root fs and it's just remounted read-only by the
standard Gentoo scripts ;)

I don't think that unmounting it is trivial (you need to chroot to a
virtual FS or something...). Does any distro do it?

> 
> What kind of speedup did you see?

with cold caches...

NORMAL
from Grub to KDM login		42"5	(~6" to reach init)
KDE 3.5.3 startup		10"
Firefox				7"

FCACHE
from Grub to KDM login		31"4	(~6" to reach init)
KDE 3.5.3 startup		4"
Firefox				2"4


:)

-- 
	Paolo Ornati
	Linux 2.6.17.1 on x86_64