Re: [LTP] [PATCH] fs_fill: Fix test when running on a 256 CPU+ machine

[Petr Vorel <pvorel@suse.cz>]

Hi Andrei,

> > > The fs_fill test runs a fill test on all the supported filesystems. One
> > > of them being vfat. This filesystem is configured dynamically or through
> > > flags/arguments for its file allocation table type (12/16/32).

> > > The size of the test device (which is a loop-mounted fs) is 300MB. When not
> > > instructed, mkfs will "automatically select between 12, 16 and 32 bit,
> > > whatever fits better for the filesystem size"[1]. In the case of a 300Mb that
> > > would end up as FAT16.
> > Interesting. BTW we plan to change 300 MB to minimal filesystem which would fit
> > to all existing tests (255 MB was for Btrfs, 300 MB was for XFS, but there might
> > be minimal systems which can use vfat, ext4, ... with smaller resources, e.g.
> > 16 MB for filesystem). Therefore I wonder what is minimal reasonable required
> > size for vfat. i.e. what MB is required for FAT32? (I guess we don't want to
> > check FAT12 or FAT16).

> The minimum/maximum values depend on the sector size. I'm not sure about
> F12 but for the other ones I think it was 32MB for 512b sectors.

Thanks a lot for info. BTW I'm not convinced any more that using as smallest
loop device size as possible is a good idea.

Kind regards,
Petr

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