Re: [HPDD-discuss] MDS dentry slabinfo

On Wed, Dec 04, 2013 at 12:25:06PM +0000, Daire Byrne wrote: maybe 2.4 has changed something (I last comprehensively tested with 1.8), but that seems like an odd thing to try to me... MDS's rarely have any VM activity going on that isn't Lustre inodes and dentries and so (in my experience) perform well (and safely) with just the default vfs_cache_pressure=100 setting. IMHO it's on OSS's where inodes/dentries fare badly in competition with Lustre's read and write-through caches where vfs_cache_pressure=0 (used with caution) can be a huge win. cheers, robin