On 08.08.2010, Marcus Kool wrote: > vm.swappiness=20 > vm.vfs_cache_pressure=50
Do you have some numbers that actually show a significant improvement? I think at least swappiness should better be 100 here, to free as much as possible memory. Unused applications hanging around for a long time can conserve quite a lot of pagecache which otherwise could be used actively. The inode cache on a system with 4 TB of diskspace is not more than ca. 400-500 MB, I doubt it makes sense to increase the kernels focus on reclaiming more pagecache (which you trying to preserve by lowering swappiness).
