Date: Wed, 28 Feb 2018 09:03:11 -0800 From: bob prohaska <fbsd@www.zefox.net> To: freebsd-arm@freebsd.org Subject: Is maximum swap usage tunable? Message-ID: <20180228170311.GA26187@www.zefox.net>
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In watching system compilations on an RPi3 it looks as if the system starts killing processes with "out of swap" warnings well below 50% of full utilization (in this case, 2 GB). One recent instance of make -j4 kernel-toolchain killed llvm-tblgen with only 34% of the swap in use. Is the maximum swap usage limit adjustable in any way? I didn't recognize anything useful in the page at https://www.freebsd.org/cgi/man.cgi?query=sysctl(8)&sektion=&manpath=freebsd-release-ports It's possible the problem is really swap speed, rather than size, so I'd like to try changing size limits if possible. The swap media claims 2-3 MB/sec random write speed and observations with gstat seem to support the claim, but transient stalls are hard to observe. An RPi2 with similar hardware seems to have no problems. Thanks for reading, bob prohaska
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