Hi Tao
> echo 'stats'|debugfs.ocfs2 /dev/sdX|grep "Incompat"
I re-read your reply with the Incompat flag check and it made me think to
check what mine were showing.
I found that my format with max-features meant that it wasn't using all the
available features.
Some are probably quite important for performance.
mkfs.ocfs2 -T mail --fs-feature-level=max-features /dev/sda
debugfs.ocfs2 stats was showing:
Feature Compat: 1 BackupSuper
Feature Incompat: 272 Sparse ExtendedSlotMap
I downloaded the ocfs2-tools via git, instead of the 1.4.1 source file on
the ocfs website, and reformatted my partition with the following options
(just in case)
mkfs.ocfs2 -T mail --fs-feature-level=max-features
--fs-features=backup-super,sparse,unwritten,inline-data,noxattr /dev/sda
debugfs.ocfs2 stats now shows:
Feature Compat: 3 BackupSuper JBD2SuperBlock
Feature Incompat: 2384 Sparse ExtendedSlotMap InlineData MetaECC
Performance is considerably better when tested with bonnie++ -n
25:1024:0:10, probably because of the inline data.
-Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files:max /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP
before 25:1024:0/10 1721 39 +++++ +++ 2655 13 1806 44 +++++ +++ 1995
19
before 50:1024:0/10 1645 62 976 8 1586 11 1469 56 120 1 336
5
after 25:1024:0/10 4015 83 +++++ +++ 3119 12 3872 80 +++++ +++ 1953
13
after 50:1024:0/10 2486 80 99692 100 2737 14 2694 88 83541 98 615
5
Are there any other features im missing that might effect performance?
And what does the incompat flags mean?
I had mistaken them to mean that these features are available but
incompatible with this partition, ie: not used.
Andy..
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