On 06/08/11 01:05, Tomas Ögren wrote:
And if pool usage is>90%, then there's another problem (change of finding free space algorithm).
Another (less satisfying) workaround is to increase the amount of free space in the pool, either by reducing usage or adding more storage. Observed behavior is that allocation is fast until usage crosses a threshhold, then performance hits a wall.
I have a small sample size (maybe 2-3 samples), but the threshhold point varies from pool to pool but tends to be consistent for a given pool. I suspect some artifact of layout/fragmentation is at play. I've seen things hit the wall at as low as 70% on one pool.
The original poster's pool is about 78% full. If possible, try freeing stuff until usage goes back under 75% or 70% and see if your performance returns.
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