Re: [PATCH] nvme/012 & 013: avoid extremely slow xfs IO

[Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>]

On 4/14/19 7:11 PM, Ming Lei wrote:
> On Mon, Apr 15, 2019 at 10:02 AM Chaitanya Kulkarni
> <Chaitanya.Kulkarni@wdc.com> wrote:
>>
>> Thanks for the patch Ming. Couple of comments below.
>> On 4/14/19 6:22 PM, Ming Lei wrote:
>>> It is observed that nvme/012 may take ~17 minutes to complete on aarch64,
>>> even worse it may trigger IO timeout on nvme-loop.
>>>
>>> Eric and Dave replied that it is because of too small log size on small
>>> disk.
>>>
>>> So pass '-l size=32m' to avoid the issue.
>>>
>>> With this patch, nvme/012 can be completed in one minute.
>>>
>> Then we should set the QUICK=1 if its taking shorter time.
> 
> That should have been a QUICK test, it is fine to set it, but it shouldn't
> belong to this patch.
> 
>>
>>> Cc: Eric Sandeen <esandeen@redhat.com>
>>> Cc: Dave Chinner <dchinner@redhat.com>
>>> Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
>>> Cc: linux-xfs@vger.kernel.org
>>> Signed-off-by: Ming Lei <ming.lei@redhat.com>
>>> ---
>>>    tests/nvme/012 | 2 +-
>>>    tests/nvme/013 | 2 +-
>>>    2 files changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/tests/nvme/012 b/tests/nvme/012
>>> index 9a6801511df7..d7a8751ec752 100755
>>> --- a/tests/nvme/012
>>> +++ b/tests/nvme/012
>>> @@ -46,7 +46,7 @@ test() {
>>>
>>>        umount ${mount_dir} > /dev/null 2>&1
>>>
>>> -     mkfs.xfs -f /dev/"${nvmedev}n1" > /dev/null 2>&1
>>> +     mkfs.xfs -l size=32m -f /dev/"${nvmedev}n1" > /dev/null 2>&1
>>>
>> As a part of this series lets move this to the helper mkfs in the
>> nvme/rc and use that call in all the file-backed ns related testcases.
>> Let me know if you want me to do that or you would like to do that as a
>> part of this series. I'm okay with anything.
> 
> I am fine with either way.
> 
Okay, let's get this in, will send out the refactoring.
> Thanks,
> Ming Lei
>