Date: Sun, 20 Aug 2023 21:29:47 +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: <73f7c9d3db8f117deb077fb17b1e352a@Leidinger.net> In-Reply-To: <CAGudoHE7RPcHpQEqKbzRM8cJcYKue17=iPVv8iOfZq03h22tTA@mail.gmail.com> References: <61ca9df1b15c0e5477ff51196d0ec073@Leidinger.net> <CAGudoHG5Fgg4184SsXhzqYRR7VPaBXZoirGvyRyJX5ihX5YG-A@mail.gmail.com> <ed1f82dd26d3cc9ec9cc16505109ec40@Leidinger.net> <CAGudoHEP8TrSzz0TL-PsOx0WNc7z3042wJk-jhhVwhTyJ0VEQQ@mail.gmail.com> <88e837aeb5a65c1f001de2077fb7bcbd@Leidinger.net> <4d60bd12b482e020fd4b186a9ec1a250@Leidinger.net> <CAGudoHE7RPcHpQEqKbzRM8cJcYKue17=iPVv8iOfZq03h22tTA@mail.gmail.com>
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Am 2023-08-20 19:10, schrieb Mateusz Guzik: > On 8/18/23, Alexander Leidinger <Alexander@leidinger.net> wrote: >> I have a 51MB text file, compressed to about 1MB. Are you interested >> to >> get it? >> > > Your problem is not the vnode limit, but nullfs. > > https://people.freebsd.org/~mjg/netchild-periodic-find.svg 122 nullfs mounts on this system. And every jail I setup has several null mounts. One basesystem mounted into every jail, and then shared ports (packages/distfiles/ccache) across all of them. > First, some of the contention is notorious VI_LOCK in order to do > anything. > > But more importantly the mind-boggling off-cpu time comes from > exclusive locking which should not be there to begin with -- as in > that xlock in stat should be a slock. > > Maybe I'm going to look into it later. That would be fantastic. Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF
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