Date: Fri, 7 Sep 2018 12:05:23 -0400 From: Mark Johnston <markj@freebsd.org> To: Subbsd <subbsd@gmail.com> Cc: allanjude@freebsd.org, freebsd-current Current <freebsd-current@freebsd.org> Subject: Re: ZFS perfomance regression in FreeBSD 12 APLHA3->ALPHA4 Message-ID: <20180907160523.GC63224@raichu> In-Reply-To: <CAFt_eMpD0UZ5kMi70RvzGso%2Bqhf26xsi5kbAJW-_pz0HrP4Z9w@mail.gmail.com> References: <CAFt_eMrhFiV0OJQ2w05-pFj4EkYr9dbYf4APLuJdBykwkOjRsQ@mail.gmail.com> <e26c530e-88e4-0481-9012-f814dd8ed569@freebsd.org> <CAFt_eMozS6_9VWBu%2B3LZ9n12bFdykZkz9HTi-zb0kgSKS2Riag@mail.gmail.com> <20180906002825.GB77324@raichu> <CAFt_eMpD0UZ5kMi70RvzGso%2Bqhf26xsi5kbAJW-_pz0HrP4Z9w@mail.gmail.com>
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On Fri, Sep 07, 2018 at 04:34:23PM +0300, Subbsd wrote: > > > > On 2018-09-05 10:04, Subbsd wrote: > > > > > Hi, > > > > > > > > > > I'm seeing a huge loss in performance ZFS after upgrading FreeBSD 12 > > > > > to latest revision (r338466 the moment) and related to ARC. > > > > > > Unfortunately, I can not conduct sufficiently serious regression tests > right now (e.g through benchmark tools, with statistics via PMC(3), > etc.). However, I can do a very surface comparison - for example with > find. > tested revision: 338520 > loader.conf settings: vfs.zfs.arc_max="128M" > > meta strategy ARC_STRATEGY_META_BALANCED result: > > % time find /usr/ports -type f > /dev/null > 0.495u 6.912s 7:20.88 1.6% 34+172k 289594+0io 0pf+0w > > meta strategy ARC_STRATEGY_META_ONLY: > % time find /usr/ports -type f > /dev/null > 0.721u 7.184s 4:57.18 2.6% 34+171k 300910+0io 0pf+0w > > So the difference in ~183 seconds. > Both test started after a full boot OS cycle. Seems like a pretty substantial difference. Is this roughly the same performance that you had before the upgrade to -ALPHA4?
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