Date: Mon, 02 Jan 2023 12:00:44 +0100 From: Alexander Leidinger <Alexander@leidinger.net> To: George Mitchell <george+freebsd@m5p.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: What is "zio->i"? Message-ID: <20230102120044.Horde.iouHjGhaxepeEKAbm7pBGb4@webmail.leidinger.net> In-Reply-To: <ea753a8b-21d4-7162-1f4c-e5033f05804d@m5p.com>
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[-- Attachment #1 --] Quoting George Mitchell <george+freebsd@m5p.com> (from Sun, 1 Jan 2023 12:52:20 -0500): > FreeBSD 13.1-RELEASE-p5, using SCHED_4BSD. > > What is "top" telling me when a process is in "zio->i" state? Every > so often, either firefox or thunderbird seemingly sits there > contemplating its own navel in that state for up to a minute or two. > It recovers of its own accord, of course, but I wish I knew what it > meant. Just a few months ago, I moved my /usr partition from UFS to > ZFS, saving myself some fsck aggravation (rarely necessary, but very > slow when needed). "top" also reports some pretty big ARC numbers > -- specifically, bigger than free memory, but not big enough to > consume any swap space: > > Mem: 1232M Active, 1577M Inact, 27M Laundry, 2675M Wired, 175M Buf, 317M Free > ARC: 1823M Total, 283M MFU, 1515M MRU, 16K Anon, 5117K Header, 13M Other > 1712M Compressed, 2135M Uncompressed, 1.25:1 Ratio > Swap: 8192M Total, 8192M Free An incomplete list of wait channels is here: https://wiki.freebsd.org/WaitChannels In your case it means most probably that it waits for some ZFS IO to finish. Happy new year, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIzBAABCAAdFiEER9UlYXp1PSd08nWXEg2wmwP42IYFAmOyuVwACgkQEg2wmwP4 2IbY4xAAiiy7WI/vdwl505QpJbjVac3Od62Mh7Rc+3XwT6a/dt150fdGqhloA3P8 5LaODEnHaJtTBreKOGNuFSk/3ZctzZNg5cTHhDiMwEzNvP+LNug3bLhEJLqAJ/h1 QFizHZvbuSqGoWiedZmgqiS0wa/kv7P5RyojEnWYD0pppWb7BKOLhBBcE7IOQ/pm anhGLiebW8VZGlXJGW8LxJIfqaEd+c7Ih3UPtTpmq6/Me6nXFlD+C6ovWTZZvd67 yyfw8IRhw/M2LHIxxxTlQAcvQVLZt0rLN51Q/8g9LSRrwWa9l7WGVNFXdgZ7GLJB iY3ss8XM5OCiXWIZhrrbygtl5PN325XZgPDcL2JIlpMTErfMYokvpLHHeC+R9m0b qbpzsKVG5ba/tMiPfLIkf+GZZT2e0413OfMfKjTNqsSHoTq+cxX5ySfGglKRBP2a iaDm6U80gBGLJilcVa2HUxqTsYAuE0ls06En14zbXoQ88kpLS7grQ3Y+q+I9vGgJ trTB5xhYbho/lSPnyegUFtuBEXlC2uKseRttPsoIQUMLSiNUcoisAUBDUxXKeLi4 uPoL7nWlt7SUIkLy1e4b++r0QK3s/XcQNfzbBLXi4eRZ6/Brdz7mKUySijkfpytf MZqxZV7gAj4PfzKyMTdfcT4t0pjKY+j+OEWKKqPdyod6+orVSvo= =xWbP -----END PGP SIGNATURE-----
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