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[Swift] Cache pressure tuning


Hi, all,
I'm facing the issue about the performance degradation, and once I glanced that changing the value in /proc/sys/vm/vfs_cache_pressure will do a favour.

Can anyone explain to me whether and why it is useful? I have scanned the Deployment Guide of OpenStack Swift <http://docs.openstack.org/developer/swift/deployment_guide.html#general-server-configuration> but cannot find anything about such tuning.

Jonathan Lu

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