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

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On Mon, Apr 15, 2019 at 10:02 AM Chaitanya Kulkarni
<Chaitanya.Kulkarni@xxxxxxx> 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@xxxxxxxxxx>
> > Cc: Dave Chinner <dchinner@xxxxxxxxxx>
> > Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
> > Cc: linux-xfs@xxxxxxxxxxxxxxx
> > Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
> > ---
> >   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.

Thanks,
Ming Lei



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