> The experience of XFS on IRIX is that unless you put the journal on
> a REALLY fast device, like a battery-backed SSD, then the difference
> in performance between an internal journal and an external one is
> noise, even on very large, active, and performance-critical
> filesystems. Ie: writing to the journal is NOT a bottleneck.
>
> This was quite a surprising result... Though it does imply that
> XFS/IRIX got the write ordering, batching, etc correct.
For general operation maybe. The internal journal is the performance
limit for metadata intensive operations such creating lots of small files.
See the respective benchmarks which I've posted to the reiserfs list some
time ago.
Ralf
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