Date: Sun, 17 Mar 2019 16:48:45 +0100 From: Rainer Duffner <rainer@ultra-secure.de> To: Karl Denninger <karl@denninger.net> Cc: freebsd-stable@freebsd.org Subject: Re: Observations from a ZFS reorganization on 12-STABLE Message-ID: <86C7CA40-EBB4-498E-BFD9-34187DBE1323@ultra-secure.de> In-Reply-To: <58eb1994-41bd-cd22-be66-0024bcbc36e6@denninger.net> References: <58eb1994-41bd-cd22-be66-0024bcbc36e6@denninger.net>
next in thread | previous in thread | raw e-mail | index | archive | help
> Am 17.03.2019 um 15:58 schrieb Karl Denninger <karl@denninger.net>: >=20 > I've long argued that the VM system's interaction with ZFS' arc cache > and UMA has serious, even severe issues. 12.x appeared to have > addressed some of them, and as such I've yet to roll forward any part = of > the patch series that is found here [ > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187594 = <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187594>; ] or the > Phabricator version referenced in the bug thread (which is = more-complex > and attempts to dig at the root of the issue more effectively, > particularly when UMA is involved as it usually is.) >=20 > Yesterday I decided to perform a fairly significant reorganization of > the ZFS pools on one of my personal machines, including the root pool > which was on mirrored SSDs, changing to a Raidz2 (also on SSDs.) This > of course required booting single-user from a 12-Stable memstick. Interesting. The patches published before Christmas 2018 solved all of the problems I = had (shared by many others, probably also visible on the FreeBSD = project=E2=80=99s own infrastructure) with 11.2 and 12.0 I run a decently sized syslog-server and the 25MB/s stream of = syslog-data was killing 11.2 almost instantly. I have a few 11.2 systems that I haven=E2=80=99t patched yet - but they = have north of 128GB of RAM and ARC had been configured down to 70% long = before that - so I never saw the issue there.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?86C7CA40-EBB4-498E-BFD9-34187DBE1323>