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Hermes SMTP Server) with ESMTPA ID 7948446c661a58a6abcb434ead47fd04; Mon, 01 May 2023 19:57:13 +0000 (UTC) Content-Type: text/plain; charset=us-ascii List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.400.51.1.1\)) Subject: Re: armv8.2-A+ tuned FreeBSD kernels vs. poudriere bulk and USB3 media: tx->tx_quiesce_done_cv related blocking of processes? From: Mark Millard In-Reply-To: Date: Mon, 1 May 2023 12:57:01 -0700 Cc: FreeBSD Hackers , freebsd-arm Content-Transfer-Encoding: 7bit Message-Id: <8F883286-D713-4632-9575-5813E885D125@yahoo.com> References: <7AE28A5B-109E-4C26-9D70-BCA5D49CD79D@yahoo.com> <02DC03AE-E082-4FB5-AA0D-396F64CC23CB@yahoo.com> To: Mateusz Guzik X-Mailer: Apple Mail (2.3731.400.51.1.1) X-Spamd-Result: default: False [-2.42 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM_SHORT(-0.92)[-0.918]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; MV_CASE(0.50)[]; R_DKIM_ALLOW(-0.20)[yahoo.com:s=s2048]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; DWL_DNSWL_NONE(0.00)[yahoo.com:dkim]; FREEMAIL_ENVFROM(0.00)[yahoo.com]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; TO_DN_ALL(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; FREEMAIL_FROM(0.00)[yahoo.com]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_TRACE(0.00)[yahoo.com:+]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_TO(0.00)[gmail.com]; RCVD_IN_DNSWL_NONE(0.00)[98.137.66.146:from]; RCVD_TLS_LAST(0.00)[]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org] X-Rspamd-Queue-Id: 4Q9DWh13rtz4Q54 X-Spamd-Bar: -- X-ThisMailContainsUnwantedMimeParts: N On Apr 30, 2023, at 18:57, Mark Millard wrote: > On Apr 30, 2023, at 17:44, Mateusz Guzik wrote: > >> can you redo zfs test with: >> sysctl vfs.zfs.per_txg_dirty_frees_percent=5 > > Sure. > > Result summary: Seems to have avoided the sustained periods > of low load average activity. Much better for the context. > > > Context: Original ZFS USB3 media. World or Kernel in use > had been built (non-debug style) using: > > -mcpu=cortex-a78C+flagm+nofp16fml > > > Steps for this test . . . > > # poudriere pkgclean -A -jmain-CA78C > . . . > > # sysctl vfs.zfs.per_txg_dirty_frees_percent=5 > vfs.zfs.per_txg_dirty_frees_percent: 30 -> 5 > > # grep USE_TMPFS= /usr/local/etc/poudriere.conf > # EXAMPLE: USE_TMPFS="wrkdir data" > USE_TMPFS="data" > #USE_TMPFS=all > > # poudriere bulk -jmain-CA78C -w -f ~/origins/CA78C-origins.txt > . . . > > At 15 minutes into the build: > 46 ports in 1st 15 minutes. Load average stayed reasonable > for the configuration. > > At 30 minutes into the build: > 102 ports in 1st 30 minutes. Load average still reasonable > for the configuration. > > Looks good compared to before. > > > I've no clue what optimal would be for the context, but > > vfs.zfs.per_txg_dirty_frees_percent=5 > > is vastly better for the context than the default 30 was. > > Thanks. > > > I'm going to stop the test and do the conversion to the > U2 960GB Optane media in the USB3 adaptor and then > compare USE_TMPFS=data vs. USE_TMPFS=all --but using your > vfs.zfs.per_txg_dirty_frees_percent=5 assignment. > Took a while to actually get around to stopping the test. It got 186 of the ports built in the 1st hour. (A from scratch build, starting with building pkg.) I finally have started the U2 960GB Optane based tests, currently USE_TMPFS=data . The initial activity looks like it might build about as many ports as the earlier USE_TMPFS=all test (for different media, vfs.zfs.per_txg_dirty_frees_percent being 30). . . . waiting . . . It got 222 of the ports built in the 1st hour, again starting with pkg. That compares to 262 for the earlier USE_TMPFS=all test. None of these ports form the first hour are large, long running port builds, none using large scale amounts of storage space for its builder. (As I build things, rust for example, uses 17GiBytes+ of file system space, more than half of the size of the RAM in the Windows Dev Kit 2023 for USE_TEMPFS=all just for file system content.) Now for a USE_TMPFS=all build test with vfs.zfs.per_txg_dirty_frees_percent being 5 . I may try letting that run to completion. (The configuration has 118 GiBytes of swap for paging activity.) === Mark Millard marklmi at yahoo.com