Re: [linux-lvm] It looks wrong for the timeout when lvm test running

[Zdenek Kabelac <zkabelac@redhat.com>]

Dne 09. 12. 19 v 11:58 Heming Zhao napsal(a):
> Hello Zdenek,
> 
> Please check the compressed file in attachment.
> 
>> 
> On 12/9/19 5:40 PM, Zdenek Kabelac wrote:
>> Dne 09. 12. 19 v 10:20 Heming Zhao napsal(a):
>>> Hello List,
>>>
>>> The lvm test default timeout (--timeout) default value is 180.
>>> But I met below condition when running testcase (in virtual machine):
>>> ```
>>> make check_local T=shell/snapshot-merge.sh
>>>  ���� ... ...
>>> ###������ passed: [ndev-vanilla] shell/snapshot-merge.sh 665
>>>  ���� ... ...
>>> ```


Hi


So your test seems to be very slow in 'mkfs.ext4':

[ 0:03] Creating journal (4096 blocks): done
[ 1:30] Writing superblocks and filesystem accounting information: done
....
[ 1:34] Creating journal (4096 blocks): done
[ 3:03] Writing superblocks and filesystem accounting information: done
....
[ 3:07] Creating journal (4096 blocks): done
[ 4:37] Writing superblocks and filesystem accounting information: done
....
[ 4:40] Creating journal (4096 blocks): done
[ 6:08] Writing superblocks and filesystem accounting information: done
....


This looks certainly seriously like a very slow (possibly doing TRIM) ??
Any idea why ?

The test seems to be using loop device created in backend file in your /tmp
(i.e.: losetup /dev/loop0 /tmp/LVMTEST11574.cJtNfnlPrj/test.img)

So any idea why your virtual machine is that slow with handling this case ?

One idea - aren't you using a storage with very slow discard processing
(i.e. ATM VDO) ?

You can setup different backend device or different location of test dir
(see 'make help' in test subdir)

Regards

Zdenek