Date: Thu, 21 Jun 2018 07:16:19 -0700 From: Mark Millard <marklmi@yahoo.com> To: Trev <freebsd-arm@sentry.org> Cc: freebsd-arm <freebsd-arm@freebsd.org>, bob prohaska <fbsd@www.zefox.net> Subject: Re: GPT vs MBR for swap devices Message-ID: <1D86911D-20D1-494A-822B-1C07C5598CB1@yahoo.com> In-Reply-To: <a232ed45-a9a9-1017-72ed-720a6c7a8f03@sentry.org> References: <25F1A4BA-FBFC-4C32-85DD-5F5BA71A2B1A@yahoo.com> <20180620023253.GA89924@www.zefox.net> <a232ed45-a9a9-1017-72ed-720a6c7a8f03@sentry.org>
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On 2018-Jun-21, at 12:28 AM, Trev <freebsd-arm at sentry.org> wrote: > I gave in and bought an Raspberry Pi 3B+ and now I've been bitten by = Bob's OOM assassin too... >=20 > % gpart show > =3D> 63 31116225 mmcsd0 MBR (15G) > 63 2016 - free - (1.0M) > 2079 102312 1 fat32lba [active] (50M) > 104391 31008825 2 freebsd (15G) > 31113216 3072 - free - (1.5M) >=20 > =3D> 0 31008825 mmcsd0s2 BSD (15G) > 0 57 - free - (29K) > 57 31008768 1 freebsd-ufs (15G) >=20 > =3D> 40 60567472 da0 GPT (29G) > 40 4194304 1 freebsd-swap (2.0G) > 4194344 56373168 2 freebsd-ufs (27G) >=20 > % cat /etc/fstab > # Custom /etc/fstab for FreeBSD embedded images > /dev/ufs/rootfs / ufs rw,noatime 1 1 > /dev/msdosfs/MSDOSBOOT /boot/msdos msdosfs rw,noatime 0 0 > md1 /tmp mfs rw,noatime,-s100m 0 0 > md2 /var/log mfs rw,noatime,-s15m 0 0 > md3 /var/tmp mfs rw,noatime,-s15m 0 0 > /dev/ufs/swap none swap sw 0 0 > /dev/ufs/usr /usr ufs rw,noatime 2 2 >=20 > da0 is a brand new 32G EMTEC USB2 memory key housing /usr and swap = partitions. >=20 > FreeBSD 12.0-CURRENT #0 r335317: Mon Jun 18 17:37:04 UTC 2018 = root@releng3.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC = arm64 >=20 > make -j4 buildworld resulted in: >=20 > Jun 21 17:05:12 rpi3 kernel: pid 10326 (c++), uid 0, was killed: out = of swap space > --- CodeGen/AsmPrinter/CodeViewDebug.o --- > c++: error: unable to execute command: Killed > c++: error: clang frontend command failed due to signal (use -v to see = invocation) > FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on = LLVM 6.0.0) > Target: aarch64-unknown-freebsd12.0 > Thread model: posix > InstalledDir: /usr/bin > c++: note: diagnostic msg: PLEASE submit a bug report to = https://bugs.freebsd.org/submit/ and include the crash backtrace, = preprocessed source, and associated run script. > c++: note: diagnostic msg: >=20 > I happened to have been watching top (5 second interval) at the time = and of the 2G swap, only 45M was shown to be in use. Are you getting errors such as those listed in: https://lists.freebsd.org/pipermail/freebsd-arm/2018-June/018091.html ? If not, your context may be a better test case than Bob P.'s. It looks like the latest from Bob P. is that when his /dev/da0 is not used for swap (and so has far less I/O) his builds finish, apparently without logging errors: = http://www.zefox.net/~fbsd/rpi3/swaptests/newtests/1gbsdflash_1.3gbusbmech= anical_swapinfo/readme where he writes: > This test used the 1 GB SD flash swap partition plus a 1.3 GB = partition=20 > on a USB mechanical disk. The -j4 buildworld ran to completion without > obvious errors, serving mostly to suggest there's nothing wrong with=20= > the read/write behavior of /dev/da0, the USB flash drive holding /usr > and with it /usr/obj. (I do not share his conclusion about /dev/da0 based on the smaller amount of I/O when it was not used for swapping.) As far as I know the swap system is far more dependent on timely I/O than the other I/O involved in a build. Even without errors considered Bob was getting things like the large ms/w figures below: > Mon Jun 18 09:42:05 PDT 2018 > Device 1K-blocks Used Avail Capacity > /dev/da0b 1048576 3412 1045164 0% > /dev/mmcsd0s3b 1048576 3508 1045068 0% > Total 2097152 6920 2090232 0% > dT: 10.043s w: 10.000s > L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps = ms/d %busy Name > 0 0 0 0 0.0 0 9 10.8 0 0 = 0.0 0.1 mmcsd0 > 46 0 0 0 0.0 0 16 12355 0 0 = 0.0 85.9 da0 > 0 0 0 0 0.0 0 9 10.8 0 0 = 0.0 0.1 mmcsd0s3 > 0 0 0 0 0.0 0 9 10.8 0 0 = 0.0 0.1 mmcsd0s3a > 33 0 0 0 0.0 0 22 12318 0 0 = 0.0 114.1 da0d > Mon Jun 18 09:42:25 PDT 2018 > Device 1K-blocks Used Avail Capacity > /dev/da0b 1048576 3412 1045164 0% > /dev/mmcsd0s3b 1048576 3508 1045068 0% > Total 2097152 6920 2090232 0% Are you getting such during the swapping activity? Overall: the I/O errors (if any) and the large ms/w (or ms/r) figures are things to look for. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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