Messages in this thread | | | Subject | Change in default vm_dirty_ratio | From | Tim Chen <> | Date | Mon, 18 Jun 2007 14:14:30 -0700 |
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Andrew,
The default vm_dirty_ratio changed from 40 to 10 for the 2.6.22-rc kernels in this patch:
http://git.kernel.org/? p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=07db59bd6b0f279c31044cba6787344f63be87ea;hp=de46c33745f5e2ad594c72f2cf5f490861b16ce1
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.
Thanks.
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