Re: Very slow mount

[Catalin Iacob <iacobcatalin@gmail.com>]

On Wed, May 30, 2012 at 11:09 PM, Josef Bacik <josef@redhat.com> wrote:
> Hrm well being on root makes it hard to figure out what is going on.  The mount
> stuff is all in reads but who knows whats going on.  Can you do bootchart so I
> can see what threads are spawned, maybe the old caching stuff is getting tripped
> for some reason.

You can find the result of running bootchart here:
http://ctrlv.in/89812

> The next thought is to boot up with a rescue disk and mount
> while running latencytop -c (you'll need this patch
> http://oss.oracle.com/~mason/latencytop.patch) and post the output somewhere so
> we can see it.

I downloaded a daily snapshot of openSUSE Factory and booted that, it
has kernel 3.4.0. Mounting took less than 10 seconds but probably
still too much:

linux:/home/linux # time mount
-onoatime,space_cache,inode_cache,autodefrag,compress=lzo -t btrfs
/dev/sda8 /mnt/

real 0m3.769s
user 0m0.005s
sys 0m0.273s

Latencytop output is at:
https://gist.github.com/2845725

Thanks for your help,
Catalin