Date: Thu, 9 Aug 2018 21:44:26 -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: <20180810044426.GB32974@www.zefox.net> In-Reply-To: <CANCZdfrC0s8X-LxJmrDmkxmz%2BGUMNsHSMpBEQmp1S5ahcvptpg@mail.gmail.com> References: <20180802015135.GC99523@www.zefox.net> <EC74A5A6-0DF4-48EB-88DA-543FD70FEA07@yahoo.com> <20180806155837.GA6277@raichu> <20180808153800.GF26133@www.zefox.net> <20180808204841.GA19379@raichu> <20180809065648.GB30347@www.zefox.net> <20180809152152.GC68459@raichu> <CANCZdfpKOTBrxiNhaeHHRp-2iw5a4eXt%2Bmd_1LTD-c0%2BAE6qxg@mail.gmail.com> <20180809153710.GC30347@www.zefox.net> <CANCZdfrC0s8X-LxJmrDmkxmz%2BGUMNsHSMpBEQmp1S5ahcvptpg@mail.gmail.com>
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On Thu, Aug 09, 2018 at 09:42:59AM -0600, Warner Losh wrote: > On Thu, Aug 9, 2018 at 9:37 AM, bob prohaska <fbsd@www.zefox.net> wrote: > > > > > There's a kernel building now with > > options CAM_IOSCHED_DYNAMIC > > in the config file. Is it still worth trying? Anything else to try? > > > > It won't be a cure-all, out of the box, I don't think. However, the read > biasing code may help sneak a few 'reads' in between writes which may help > keep away from the pathological behavior.... Or not, it's hard to say... > I've not looked at swapping to super-crappy nand (I mean thumb drives) in > as much detail as the drives we use for work. > Alas, 'tis true. Combined with the patches so far it didn't seem to help at all, with or without using vm.pageout_oom_seq to 120. The -j4 buildworld ended with an OOMA kill using 12 and a panic and reboot at 120. A -j4 buildworld actually got farther using vm.pageout_oom_seq=120 with no other changes. Results are at http://www.zefox.net/~fbsd/rpi3/swaptests/r337226M/1gbsdflash_1gbusbflash/batchqueue/pageout120/slow_swap/cam_iosched_dynamic/ Any suggestions on what to try next would be welcome. Thanks for reading, bob prohaska
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