Re[2]: ARC "pressured out", how to control/stabilize ? (reformatted to text/plain)

From: Vladimir Sharun <atz_at_ukr.net>
Date: Tue, 14 Jan 2014 07:27:47 +0200

('binary' encoding is not supported, stored as-is) Dear Andriy and FreeBSD community, > I am not sure if the buffers are leaked somehow or if they are actually in use. > It's one of the very few places where data buffers are allocated without > charging ARC. In all other places it's quite easy to match allocations and > deallocations. But in L2ARC it is not obvious that all buffers get freed or > when that happens. After one week under load I think we figure out the cause: it's L2ARC. Here's the top's header for 7d17h of the runtime: last pid: 46409; load averages: 0.37, 0.62, 0.70 up 7+17:14:01 07:24:10 173 processes: 1 running, 171 sleeping, 1 zombie CPU: 2.0% user, 0.0% nice, 3.5% system, 0.4% interrupt, 94.2% idle Mem: 8714M Active, 14G Inact, 96G Wired, 1929M Cache, 3309M Buf, 3542M Free ARC: 85G Total, 2558M MFU, 77G MRU, 28M Anon, 1446M Header, 4802M Other ARC related tunables: vm.kmem_size="110G" vfs.zfs.arc_max="90G" vfs.zfs.arc_min="42G" For more than 7 days of hard runtime the picture clearly shows: Wired minus ARC = 11..12Gb, ARC grow and shrinks in 80-87Gb range and the system runs just fine. So what shall we do with L2ARC leakage ? Received on Tue Jan 14 2014 - 04:27:59 UTC