Date: Sun, 4 Mar 2018 20:57:23 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Ian Lepore <ian@freebsd.org> Cc: Warner Losh <imp@bsdimp.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, bob prohaska <fbsd@www.zefox.net> Subject: Re: Is maximum swap usage tunable? Message-ID: <20180305045723.GA47820@www.zefox.net> In-Reply-To: <20180304214003.GB44154@www.zefox.net> References: <20180228185517.GB26187@www.zefox.net> <8f422161-885e-aa91-eacd-018540222d65@mgm51.com> <20180228214301.GA29481@www.zefox.net> <b82801b8-bc29-414c-1170-621bb4a5d937@mgm51.com> <CANCZdfq_MpxjUyVd-=%2BMiAQAER4TeDh9irhx_evdXwa3yt3h0g@mail.gmail.com> <20180303162605.GA41874@www.zefox.net> <20180304182831.GA44154@www.zefox.net> <CANCZdfpcccDuhJh4EF0C4KFz=dcN5mWvQ9aMiyF53kD=hMzy3Q@mail.gmail.com> <1520189171.38056.2.camel@freebsd.org> <20180304214003.GB44154@www.zefox.net>
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On Sun, Mar 04, 2018 at 01:40:03PM -0800, bob prohaska wrote: > make -j4 buildworld > > was started with the usb-hosted swap partition turned off, leaving only > the microSD-hosted swap running. It got past the first cycle of llvm-tblgen > showing only half of the one GB available swap in use, with no errors or > warnings. There is some decent chance it'll run to completion, probably > late tomorrow. For now I'll just see how far it gets. > The j4 buildworld using only 1 GB swap on microSD really ran out of swap after a prolonged (half hour or so) interval of swread and pfault status in top and a stream of swap_pager_getswapspace(4): failed swap_pager_getswapspace(4): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(3): failed Mar 4 20:02:09 www kernel: pid 25154 (c++), uid 0, was killed: out of swap space swap_pager_getswapspace(4): failed swap_pager_getswapspace(4): failed swap_pager_getswapspace(4): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(2): failed swap_pager_getswapspace(4): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(4): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(4): failed Mar 4 20:02:49 www kernel: pid 25128 (c++), uid 0, was killed: out of swap space swap_pager_getswapspace(4): failed swap_pager_getswapspace(3): failed swap_pager_getswapspace(7): failed on the console. There were no "indefinite wait" messages at all It appears that swap on microSD worked much better than swap on USB, only failing after hitting 85% or more of utilization and even then not giving up easily. The log files for buildworld and gstat are at http://www.zefox.net/~fbsd/rpi3/swap_issues/ on the chance they're worth looking at. bob prohaska
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