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[79.66.147.78]) by smtp.gmail.com with ESMTPSA id c205sm1021514wmd.33.2020.09.08.15.45.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Sep 2020 15:45:30 -0700 (PDT) Subject: Re: OpenZFS and L2ARC To: Stefan Esser , FreeBSD CURRENT , freebsd-fs@freebsd.org Cc: Matthew Macy , Allan Jude References: From: Graham Perrin Message-ID: <7d54dc30-b8b1-a127-ec39-9fb759c8a55d@gmail.com> Date: Tue, 8 Sep 2020 23:45:29 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Rspamd-Queue-Id: 4BmKx85Ddpz4ZZQ X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.44 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-0.45)[-0.448]; RECEIVED_SPAMHAUS_PBL(0.00)[79.66.147.78:received]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.983]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.01)[-1.008]; MIME_GOOD(-0.10)[text/plain]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::443:from]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-fs,freebsd-current] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Sep 2020 22:45:33 -0000 On 08/09/2020 08:43, Stefan Esser wrote: > OpenZFS seems to work quite well for me, in general, but I have > questions regarding the L2ARC statistics. > … > The sysutils/zfs-stats port reports the following values for > this system, BTW: > > ------------------------------------------------------------------------ > ZFS Subsystem Report                Tue Sep  8 09:02:46 2020 > ------------------------------------------------------------------------ > … > > Quite a number of sysctl variable names have changed, and the port > needs to be adapted to the new names (therefore there are lots of 0 > values in the -L output). > > The following names used by zfs-stats do not exist in OpenZFS: > > kstat.zfs.misc.arcstats.recycle_miss > kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned > kstat.zfs.misc.arcstats.l2_write_buffer_iter > kstat.zfs.misc.arcstats.l2_write_buffer_list_iter > kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter > kstat.zfs.misc.arcstats.l2_write_full > kstat.zfs.misc.arcstats.l2_write_in_l2 > kstat.zfs.misc.arcstats.l2_write_io_in_progress > kstat.zfs.misc.arcstats.l2_write_not_cacheable > kstat.zfs.misc.arcstats.l2_write_passed_headroom > kstat.zfs.misc.arcstats.l2_write_pios > kstat.zfs.misc.arcstats.l2_write_spa_mismatch > kstat.zfs.misc.arcstats.l2_write_trylock_fail > kstat.zfs.misc.arcstats.l2_writes_hdr_miss > vfs.zfs.vdev.cache.size > > The existence of vfs.zfs.vdev.cache.size vs vfs.zfs.vdev.cache_size > can be used to detect OpenZFS, and is easily fixed. > > But the above listed L2ARC values seem to have been removed from or > have never existed in OpenZFS, and I did not find any substitutes. > > Are there any plans to re-create them in OpenZFS on FreeBSD or are > they gone for good? Recalling , on 28/03/2020 15:17,28/03/2020 15:17, Allan Jude wrote: >> … >> >> Basically 'arc' was converted to a subtree. >> >> We should add some backwards compat sysctls to cover some of >> these renames etc so configs and scripts don't break etc. > > I'd like to update the zfs-stats port for compatibilíty with OpenZFS ... > Cool!