Hi,
I experience some strange problems with my loopback-on-ext3-setup and it
would be very helpful if some of you could confirm this behaviour.
It's a very simple setup:
1) create a dummy file (size: 5GB)
dd if=/dev/zero of=dummy bs=1M count=5000
2) create a loopback device on the dummy file
losetup /dev/loop/0 dummy
3) write on the loopback device or create a filesystem
dd if=/dev/zero of=/dev/loop/0 bs=1M
mke2fs -m 0 /dev/loop/0
Both commands (dd and mke2fs) should take ages to complete while hanging
around in WCHAN `congestion_wait' for most of the time.
To find out, what your dd is doing right now, you could do this:
ps -eo command,wchan | grep ^dd
or check top(1).
Thanks,
Petar
P.S: $ uname -a
Linux pintail 2.6.23-ARCH #1 SMP PREEMPT Sat Oct 27 09:04:14 UTC
2007 i686 Intel(R) Pentium(R) M processor 1.70GHz GenuineIntel
GNU/Linux
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