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[109.210.55.124]) by smtp.gmail.com with ESMTPSA id k128sm13510657wmd.37.2018.12.21.02.38.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 21 Dec 2018 02:38:56 -0800 (PST) From: Ben RUBSON Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 12.2 \(3445.102.3\)) Subject: Re: [ZFS] Metadata Allocation Classes Date: Fri, 21 Dec 2018 11:38:55 +0100 References: <82E338C0-09E3-4648-B49B-C028A03B71D7@gmail.com> To: freebsd-fs@freebsd.org In-Reply-To: <82E338C0-09E3-4648-B49B-C028A03B71D7@gmail.com> Message-Id: X-Mailer: Apple Mail (2.3445.102.3) X-Rspamd-Queue-Id: 78D2C90833 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=HUnHeRKB; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of benrubson@gmail.com designates 2a00:1450:4864:20::442 as permitted sender) smtp.mailfrom=benrubson@gmail.com X-Spamd-Result: default: False [-4.01 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; MV_CASE(0.50)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; NEURAL_HAM_SHORT(-0.95)[-0.952,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; IP_SCORE(-0.54)[ip: (0.44), ipnet: 2a00:1450::/32(-1.64), asn: 15169(-1.43), country: US(-0.08)]; RCVD_IN_DNSWL_NONE(0.00)[2.4.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0] X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Dec 2018 10:39:00 -0000 > On 22 Nov 2018, Ben RUBSON wrote: >=20 > Hi, >=20 > Intel has pushed the "Metadata Allocation Classes" feature to ZFS on = Linux. > This allows to store metadata on a so called "special" VDEV, made of = SSD for instance. >=20 > This looks really promising. > I wrote a patch 2 years ago which pins metadata in L2ARC, at eviction = time. > This really helps with some specific workloads. > But "Metadata Allocation Classes" should be one step further in terms = of performance. >=20 > Simple question, do you plan to backport this feature to FreeBSD ? > Or do you first wait for it to reach Illumos (does not seem to be = there yet) ? >=20 > ZoL discussion : https://github.com/zfsonlinux/zfs/issues/3779 > ZoL PR : https://github.com/zfsonlinux/zfs/pull/5182 I answer to myself, well "The future of ZFS in FreeBSD" topic in this = list does :-) Ben