Re: [Qemu-devel] Failing QEMU iotest 175

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Mon, May 06, 2019 at 12:44:56PM -0500, Eric Blake wrote:
> On 5/4/19 1:51 AM, Thomas Huth wrote:
> 
> >> Hmm, it's passing for me on ext4, but that probably means we have
> >> different configuration parameters. I'm not sure how to easily show what
> >> parameters a particular ext4 partition uses to compare the differences
> >> between your setup and mine (mine is tuned to whatever defaults Fedora's
> >> installer chose on my behalf), so maybe someone else can chime in.
> > 
> > $ sudo tune2fs -l /dev/mapper/Home
> > tune2fs 1.42.9 (28-Dec-2013)
> > Filesystem volume name:   <none>
> > Last mounted on:          /home
> > Filesystem magic number:  0xEF53
> > Filesystem revision #:    1 (dynamic)
> > Filesystem features:      has_journal ext_attr dir_index filetype
> > needs_recovery meta_bg extent 64bit flex_bg sparse_super large_file
> > huge_file uninit_bg dir_nlink extra_isize
> > Filesystem flags:         signed_directory_hash
> > Default mount options:    user_xattr acl
> > Filesystem state:         clean
> > Errors behavior:          Continue
> > Filesystem OS type:       Linux
> > Inode count:              36700160
> > Block count:              146800640
> > Reserved block count:     5873663
> > Free blocks:              56266267
> > Free inodes:              35403275
> > First block:              1
> > Block size:               1024
> > Fragment size:            1024
> > Group descriptor size:    64
> > Blocks per group:         8192
> > Fragments per group:      8192
> > Inodes per group:         2048
> > Inode blocks per group:   256
> > First meta block group:   258
> > Flex block group size:    16
> > Filesystem created:       Thu Apr 19 18:34:33 2018
> > Last mount time:          Sat May  4 08:20:36 2019
> > Last write time:          Sat May  4 08:20:36 2019
> > Mount count:              224
> > Maximum mount count:      -1
> > Last checked:             Thu Apr 19 18:34:33 2018
> > Check interval:           0 (<none>)
> > Lifetime writes:          1826 GB
> > Reserved blocks uid:      0 (user root)
> > Reserved blocks gid:      0 (group root)
> > First inode:              11
> > Inode size:	          128
> > Journal inode:            8
> > First orphan inode:       11076944
> > Default directory hash:   half_md4
> > Directory Hash Seed:      08e1be04-c3a3-4c37-a059-cf54af5c4bc0
> > Journal backup:           inode blocks
> > 
> 
> # tune2fs -l /dev/mapper/fedora-home
> tune2fs 1.44.6 (5-Mar-2019)
> Filesystem volume name:   home
> Last mounted on:          /home
> Filesystem UUID:          3ef45c0b-b2a0-43da-a1d3-c4f726097eda
> Filesystem magic number:  0xEF53
> Filesystem revision #:    1 (dynamic)
> Filesystem features:      has_journal ext_attr resize_inode dir_index
> filetype needs_recovery extent 64bit flex_bg sparse_super large_file
> huge_file dir_nlink extra_isize metadata_csum
> Filesystem flags:         signed_directory_hash
> Default mount options:    user_xattr acl
> Filesystem state:         clean
> Errors behavior:          Continue
> Filesystem OS type:       Linux
> Inode count:              13107200
> Block count:              52428800
> Reserved block count:     2621440
> Free blocks:              27184765
> Free inodes:              12049129
> First block:              0
> Block size:               4096
> Fragment size:            4096
> Group descriptor size:    64
> Reserved GDT blocks:      1024
> Blocks per group:         32768
> Fragments per group:      32768
> Inodes per group:         8192
> Inode blocks per group:   512
> Flex block group size:    16
> Filesystem created:       Thu Dec  6 16:17:23 2018
> Last mount time:          Wed Apr  3 10:19:05 2019
> Last write time:          Wed Apr  3 10:19:05 2019
> Mount count:              12
> Maximum mount count:      -1
> Last checked:             Thu Dec  6 16:17:23 2018
> Check interval:           0 (<none>)
> Lifetime writes:          1962 GB
> Reserved blocks uid:      0 (user root)
> Reserved blocks gid:      0 (group root)
> First inode:              11
> Inode size:	          256
> Required extra isize:     32
> Desired extra isize:      32
> Journal inode:            8
> First orphan inode:       5248434
> Default directory hash:   half_md4
> Directory Hash Seed:      d1bbea0e-dd2e-4df7-b7f0-f7300c524cc9
> Journal backup:           inode blocks
> Checksum type:            crc32c
> Checksum:                 0x3a8a8676
> 
> I'm definitely seeing some differences in the two configs (such as your
> block size of 1k vs. mine at 4k), but not sure which are the most
> important, nor how to easily recreate a setup that matches yours.

Yes, previously when we had similar issues it was the block size that
caused the difference.  It's worth trying it out with a test file system
on a loop device.

Stefan

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