Date: Wed, 20 Feb 2019 16:47:25 -0500 From: George <g.lister@nodeunit.ch> To: Mike Clarke <jmc-freebsd2@milibyte.co.uk> Cc: FreeBSD questions <freebsd-questions@freebsd.org> Subject: Re: Full swap partition Message-ID: <20190220164725.7421f6eb@x140e> In-Reply-To: <2726723.yzQzn1nXtE@curlew> References: <2726723.yzQzn1nXtE@curlew>
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On Wed, 20 Feb 2019 16:46:33 +0000 Mike Clarke <jmc-freebsd2@milibyte.co.uk> wrote: > I'm running kde desktop on FreeBSD 11.2 on a system with 16GB RAM and > 8GB swap. Normally I don't use any swap space but after a huge pkg > upgrade three days ago I've suffered a problem with the entire swap > partition filling up and the system freezing on about 4 occasions. > > I suspect that this might be due to a bug in plasma5-plasma-workspace > which was upgraded from version 5.14.5.1 to 5.15.0 because it now > appears to require 128GB virtual memory > > curlew:/home/mike% top -o size > last pid: 1738; load averages: 0.22, 0.32, 0.21 up > 0+00:12:44 16:11:28 144 processes: 1 running, 142 sleeping, 1 zombie > CPU 0: 0.8% user, 0.0% nice, 0.4% system, 0.4% interrupt, 98.4% > idle CPU 1: 0.8% user, 0.0% nice, 0.4% system, 0.0% interrupt, > 98.8% idle CPU 2: 1.6% user, 0.0% nice, 1.2% system, 0.0% > interrupt, 97.3% idle CPU 3: 0.0% user, 0.0% nice, 0.0% system, > 0.0% interrupt, 100% idle Mem: 1653M Active, 470M Inact, 2104M > Wired, 40K Buf, 11G Free ARC: 1264M Total, 430M MFU, 801M MRU, 4703K > Anon, 4920K Header, 24M Other 742M Compressed, 1059M Uncompressed, > 1.43:1 Ratio Swap: 8192M Total, 8192M Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME > WCPU COMMAND 1272 mike 13 20 0 128G 210M select 3 > 0:05 0.01% plasmashe > > The corresponding value for SIZE before the upgrade was 293M. > > The problem is only sporadic, I can run for several hours with no > swap being used (as in the above output from top) and then it > suddenly fills up. > I had to set the kernel tune-able parameter for the max swap to use on an NFS machine as it was experiencing out-of-swap space issues. I did a search and found a post on the forums someone having a similar issue. What I did was get the page number that was allocated by the installer on setup and set in /boot/loader.conf it is called kern.maxswzone that as far as I understand is a directive as to the max available if not present the kernel books double ram which explains mine and and your issue. Have been running like that is for a while now and no issues ...
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