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. Thanks, Jonathan Lu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20130617/1ba7ad3b/attachment.html>