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SubjectChange in default vm_dirty_ratio

The default vm_dirty_ratio changed from 40 to 10
for the 2.6.22-rc kernels in this patch:

IOZone write drops by about 60% when test file size is 50 percent of
memory. Rand-write drops by 90%.

Is there a good reason for turning down the default dirty ratio?
How will it help for most cases? Intuitively, it seems like
a less aggressive writeback will have better performance.


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