Date: Wed, 8 Aug 2018 23:42:10 -0700 From: bob prohaska <fbsd@www.zefox.net> To: Warner Losh <imp@bsdimp.com> Cc: Mark Johnston <markj@freebsd.org>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, bob prohaska <fbsd@www.zefox.net> Subject: Re: RPI3 swap experiments ["was killed: out of swap space" with: "v_free_count: 5439, v_inactive_count: 1"] Message-ID: <20180809064210.GA30347@www.zefox.net> In-Reply-To: <CANCZdfpsTapeVYmwPNy1vKCueMh_D4osB8ohJJEV=GPabuxLYw@mail.gmail.com> References: <2222ABBD-E689-4C3B-A7D3-50AECCC5E7B2@yahoo.com> <20180801034511.GA96616@www.zefox.net> <201808010405.w7145RS6086730@donotpassgo.dyslexicfish.net> <6BFE7B77-A0E2-4FAF-9C68-81951D2F6627@yahoo.com> <20180802002841.GB99523@www.zefox.net> <20180802015135.GC99523@www.zefox.net> <EC74A5A6-0DF4-48EB-88DA-543FD70FEA07@yahoo.com> <20180806155837.GA6277@raichu> <20180808214224.GA29312@www.zefox.net> <CANCZdfpsTapeVYmwPNy1vKCueMh_D4osB8ohJJEV=GPabuxLYw@mail.gmail.com>
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On Wed, Aug 08, 2018 at 03:55:52PM -0600, Warner Losh wrote: > > With the da driver there's some hope. Add options IOSCHED to the kernel > config file and reboot. This will give you some detailed statistics, as > well as power-of-two bucketized latency histograms. It may even be a vector > forward to slow the writes / trims down, though there's some issues when > you slow writes down TOO much, it helps *A*LOT* keep the system responsive. > We do that at work to make our consumer SSDs not suck for serving content > (reading) while we're doing some writes to them... The thumb drives are > like the consumer SSDs we buy, only crappier... > I tried adding options IOSCHED to the arm64 GENERIC kernel config at the end of the debugging support options, but buildkernel replied with /usr/src/sys/arm64/conf/GENERIC: unknown option "IOSCHED" I don't see any typos, should this option go elsewhere? Thanks very much! bob prohaska
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