Date: Fri, 29 Mar 2019 10:38:43 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: Robert Schulze <rs@bytecamp.net> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: 11.2-STABLE kernel wired memory leak Message-ID: <89A58F93-12DD-4F66-BA08-7A8C462459AC@gromit.dlib.vt.edu> In-Reply-To: <d7d86bc2-0623-960e-2437-81907ea68e38@bytecamp.net> References: <d8c7abc0-3ba1-40e4-22b1-1b30d28ced14@grosbein.net> <d7d86bc2-0623-960e-2437-81907ea68e38@bytecamp.net>
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On Mar 29, 2019, at 5:52 AM, Robert Schulze <rs@bytecamp.net> wrote: > Hi, >=20 > I just want to report a similar issue here with 11.2-RELEASE-p8. >=20 > The affected machine has 64 GB ram and does daily backups from several > machines in the night, at daytime there a parallel runs of clamav on a > specific dataset. >=20 > One symtom is basic I/O-performance: After upgrading from 11.1 to 11.2 > backup times have increased, and are even still increasing. After one > week of operation, backup times have doubled - without having changed > anything else. >=20 > Then there is this wired memory and way too lazy reclaim of memory for > user processes: The clamav scans start at 10:30 and get swapped out > immediatly. Although vfs.zfs.arc_max=3D48G, wired is at 62 GB before = the > scans and it takes about 10 minutes for the scan processes to actually > run on system ram, not swap. >=20 > There is obviously something broken, as there are several threads with > similar observations. I am using FreeBSD 12 (both -RELEASE and -STABLE) and your comment about = "way too lazy reclaim of memory" struck a chord with me. On one system = I regularly have hundreds of MB identified as being in the "Laundry" = queue but FreeBSD hardly ever seems to do the laundry. I see the same = total for days. When does FreeBSD decide to do its laundry? Right now "top" is showing = 835M in "Laundry" and the system is >99% idle. How can I get the system to be more proactive about doing its = housekeeping when it has idle time? It would be much nicer to have it do laundry during a calm time rather = than get all flustered when it's down to its last pair of socks = (metaphorically speaking) and page even more stuff out to swap. :-) Cheers, Paul.
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