Date: Thu, 14 Jun 2018 17:01:29 +1000 From: Peter Jeremy <peter@rulingia.com> To: Albert Shih <Albert.Shih@obspm.fr> Cc: freebsd-fs@freebsd.org Subject: Re: What append when arc full Message-ID: <20180614070129.GE88895@server.rulingia.com> In-Reply-To: <20180614054333.GA7053@io.chezmoi.fr> References: <20180613200700.GA3156@io.chezmoi.fr> <248ad0be-2002-89b5-0c1a-3ac73d493149@ShaneWare.Biz> <20180614054333.GA7053@io.chezmoi.fr>
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--1UWUbFP1cBYEclgG Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2018-Jun-14 07:43:33 +0200, Albert Shih <Albert.Shih@obspm.fr> wrote: >But my concern are what append if I shrink a little more the arc_max, let's >say 64G knowing I got < 30To of data. Does I'm going to loose lot of >performance ? This really depends on your workload and the disk access pattern. I suggest you install sysutils/zfs-stats and look at the various ARC hit/miss rates once your system has stabilised. You might find that tuning vfs.zfs.arc_meta_limit can also help - by default, it's 1/4 of ARC but in my experience, metadata misses are more expensive so increasing that can help. --=20 Peter Jeremy --1UWUbFP1cBYEclgG Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE7rKYbDBnHnTmXCJ+FqWXoOSiCzQFAlsiEsRfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEVF QjI5ODZDMzA2NzFFNzRFNjVDMjI3RTE2QTU5N0EwRTRBMjBCMzQACgkQFqWXoOSi CzRJ7Q//Uwc3NmYksOaFmDr9Pr7qjXY6LtmqFacIHsrQ1X7M3x873l1g10O0l1jR TTgO7ZQi+8h9KvKLpCQSZLp8ez6Nd1QX/Bx+t1Yq2lFMfOJLvk8VyfKcTtUteLjn wVHRtgBDxSezcAbyGPTVrjqHp89K9LDQu3dhw5SDU1KmFIZxOt9t4fOUMfE/o1cK qL/+D1skBY7DFABwMqL+w7HINYQDTPp3HWduBI5tsJ5NtuJrL1BRA3A6G1wT8zl4 kZCmtbyr5avEfBqaTbAqU7hs7hC9XbHgtsM0x0a0kB28I8JasA+9vC37Qu68myWD O7kSxN7UfjRQUcqmKJjeseGSVzerYsOWyF8+Tf/59Y4Rc/ULBTwzjPHl2X+aL3ca OyBb0eexwSBox9KbroBdZQHd1FvLbhqIsmIiSlINjZAuIlkidVvYuTCYq2H6d4z1 72qRn0vj89wSI2YHJkDKXwrkDNkId4rsJSFWhLhuIyrUt6Y0PIwyLOszio6hxHHA h6cBoWNeNTFlBDIiC6nHK+y4e2xN6c4pcCiXaEV2yQfA7sar6cPtmjVikTH8IuNU PEjhNAmdpLHmaw1pwzOPtFechoIGkHxaFpbgS7DUcji6RwavB22mzoBCh9qOxgt0 +uWXTU9vYBOpsH1PSvfTwMTdb64KKjyMGG83Yx+PXFaux3OCIKY= =lubT -----END PGP SIGNATURE----- --1UWUbFP1cBYEclgG--
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