Date: Wed, 16 Aug 2023 18:48:00 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Mateusz Guzik <mjguzik@gmail.com> Cc: current@freebsd.org Subject: Re: Speed improvements in ZFS Message-ID: <88e837aeb5a65c1f001de2077fb7bcbd@Leidinger.net> In-Reply-To: <CAGudoHEP8TrSzz0TL-PsOx0WNc7z3042wJk-jhhVwhTyJ0VEQQ@mail.gmail.com> References: <61ca9df1b15c0e5477ff51196d0ec073@Leidinger.net> <CAGudoHG5Fgg4184SsXhzqYRR7VPaBXZoirGvyRyJX5ihX5YG-A@mail.gmail.com> <ed1f82dd26d3cc9ec9cc16505109ec40@Leidinger.net> <CAGudoHEP8TrSzz0TL-PsOx0WNc7z3042wJk-jhhVwhTyJ0VEQQ@mail.gmail.com>
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Am 2023-08-15 23:29, schrieb Mateusz Guzik: > On 8/15/23, Alexander Leidinger <Alexander@leidinger.net> wrote: >> Am 2023-08-15 14:41, schrieb Mateusz Guzik: >> >>> With this in mind can you provide: sysctl kern.maxvnodes >>> vfs.wantfreevnodes vfs.freevnodes vfs.vnodes_created vfs.numvnodes >>> vfs.recycles_free vfs.recycles >> >> After a reboot: >> kern.maxvnodes: 10485760 >> vfs.wantfreevnodes: 2621440 >> vfs.freevnodes: 24696 >> vfs.vnodes_created: 1658162 >> vfs.numvnodes: 173937 >> vfs.recycles_free: 0 >> vfs.recycles: 0 New values after one rund of periodic: kern.maxvnodes: 10485760 vfs.wantfreevnodes: 2621440 vfs.freevnodes: 356202 vfs.vnodes_created: 427696288 vfs.numvnodes: 532620 vfs.recycles_free: 20213257 vfs.recycles: 0 >>> Meanwhile if there is tons of recycles, you can damage control by >>> bumping kern.maxvnodes. What's the difference between recycles and recycles_free? Does the above count as bumping the maxvnodes? >> Looks like there are not much free directly after the reboot. I will >> check the values tomorrow after the periodic run again and maybe >> increase by 10 or 100 so see if it makes a difference. >> >>> If this is not the problem you can use dtrace to figure it out. >> >> dtrace-count on vnlru_read_freevnodes() and vnlru_free_locked()? Or >> something else? >> > > I mean checking where find is spending time instead of speculating. > > There is no productized way to do it so to speak, but the following > crapper should be good enough: [script] I will let it run this night. Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF
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