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[Jonathan Lu <jojokururu@xxxxxxxxx>]

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