Date: Wed, 24 Jun 2020 23:27:27 -0700 From: Kevin Oberman <rkoberman@gmail.com> To: "Greg 'groggy' Lehey" <grog@freebsd.org> Cc: Donald Wilde <dwilde1@gmail.com>, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: swap space issues Message-ID: <CAN6yY1te3ZzyY3JdhQAf4_CbD%2Bsf2sjXzU5PH63T2YV2erYS=A@mail.gmail.com> In-Reply-To: <20200625052949.GC10210@eureka.lemis.com> References: <CAEC7391qs%2BA-jMpR1RyvR-BmnLyiksXHkQUjsGeePuEZJfMciw@mail.gmail.com> <20200625000410.GA10210@eureka.lemis.com> <CAEC7390VDxbYSY%2B4_fEaYxwdSPzbFWUVTdHw=vbAgq%2Bnmv09Vw@mail.gmail.com> <20200625025248.GB10210@eureka.lemis.com> <CAEC73938Wjb5MHvLW36PdoAy_nso-tSN51AhUYydC6qxY99pog@mail.gmail.com> <20200625052949.GC10210@eureka.lemis.com>
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On Wed, Jun 24, 2020 at 10:30 PM Greg 'groggy' Lehey <grog@freebsd.org> wrote: > On Wednesday, 24 June 2020 at 20:34:24 -0700, Donald Wilde wrote: > > On 6/24/20, Greg 'groggy' Lehey <grog@freebsd.org> wrote: > >> On Wednesday, 24 June 2020 at 18:51:04 -0700, Donald Wilde wrote: > >>> On 6/24/20, Greg 'groggy' Lehey <grog@freebsd.org> wrote: > >>>> On Wednesday, 24 June 2020 at 9:36:23 -0700, Donald Wilde wrote: > >>>>> All, > >>>>> > >>>>> I recently upgraded my 12-STABLE system to the latest, and now my > >>>>> swap subsystems aren't working. I deliberately set up a 40GB > >>>>> partition for swap, and when I do 'top -t' I am only seeing 7906M > >>>>> total. > >>>> > >>>> That looks suspiciously like the difference from 32 GB. Could it be > >>>> numeric overflow? And if so, where? What does pstat -s say? > >>> > >>> Well, hi Greg! LTNT2! > >> > >> Indeed. > >> > >>> pstat -shm: > >>> > >>> /dev/ada0s1b 65536 (1M blocks), Used: 1.5G, Avail: 63G, Capacity: 2% > >> > >> Now that's really puzzling. Why does it say 64 G when you said 40 G, > >> and the error from top tends to confirm it? How big is the partition > >> (gpart output)? > > > > Attached 'gpart list' output > > FWIW, gpart show would have done the job. But what I see there is Yet > Another swap partition size, 66 GB. So so far we have various parts > reporting 8 GB, 40 GB, 64 GB and 66 GB. > > > Reduced kern.maxswzone to 9999999. Is it decimal or unlabeled hex? > > It'll be decimal, but it refers to the number of swblk structures > assigned in memory, and after reading the code I'm still not 100% in > the clear how this relates to the size of swap, if at all. > > > 'top' now shows 4597M total swap. > > ... and 4.6 GB. 5 different sizes. > > You really shouldn't be relying on top for swap info. It's a third > party program that demonstrably shows incorrect results (though I > believe that the maintainer would be very interested to know why and > to fix it). But pstat -s (without any further options) should show > what the kernel thinks. > > >>> What else can I share to help diagnose this? > >> > >> Background, maybe? You say that you upgraded your system. Did you > >> change the swap size when you did? What were swap and RAM sizes > >> before and after? > > > > Meant that I upgraded from 12.1-RELEASE to 12-STABLE. When I > > configured the -RELEASE install, I manually messed with the MBR disk > > partitions. This is nominally a half-TB HDD which showed up as a total > > of 446 G available (IIRC, gpart should show it's actual size). I did > > auto partitioning, looked at the sizes, and manually set my partitions > > to give me 40G of swap instead of the auto-generated size of 4G. > > That's really puzzling. It seems that it gave you much more than you > asked for. > > Try this in single user mode: modify the size of the swap partition to > 30 GB. I haven't used MBR partitions for years now, but I believe > that 'bsdlabel -e' will do the trick. Just shorten the length of the > b partition. You may need to 'mount -u /'. If you do it right > (check!), this won't harm any of the other partitions: it'll just > leave 26 GB free between the swap partition and the next partition. > gpart(8) works just fine on MBR drives and partitions/slices and has a much friendlier user interface. "gpart resize" is the command you want. -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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