Re: [PATCH 2/2] HACK: do I/O read requests while ext3 journal recovers

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Andreas Dilger wrote:
On Jul 14, 2009  17:03 +0300, Adrian Hunter wrote:
The ext3 journal can take a long time to recover at mount
time.  That was partially fixed by placing a barrier into
the I/O queue and then not waiting for the actual I/O to
complete.

Note that you can also reduce the journal recovery time by
reducing the size of the journal.  Having a large journal
is needed for getting good performance with lots of updates
at high speeds.  If you aren't doing a large amount of
filesystem IO (which I'd guess for an embedded device, assuming
you are using it for that), then you could reduce the size of
the journal to the minimum (1000 blocks) and this will also
reduce the recovery time correspondingly.

Yes that may help, although the number of blocks involved is
fairly small.


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