On Mon, 25 Jun 2007, Heikki Linnakangas wrote:
It only scans bgwriter_lru_percent buffers ahead of the clock hand. If the hand isn't moving, it keeps scanning the same buffers over and over again. You can crank it all the way up to 100%, though, in which case it would work, but that starts to get expensive CPU-wise.
In addition to being a CPU pig, that still won't necessarily work because the way the LRU writer ignores things with a non-zero usage_count. If it's dirty, it's probably been used recently as well.
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