Date: Wed, 30 Jan 2013 14:59:15 -0600 From: Kevin Day <toasty@dragondata.com> To: Nikolay Denev <ndenev@gmail.com> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Improving ZFS performance for large directories Message-ID: <D606CCAE-511F-46DC-838B-E1994B973309@dragondata.com> In-Reply-To: <23E6691A-F30C-4731-9F78-FD8ADDDA09AE@gmail.com> References: <19DB8F4A-6788-44F6-9A2C-E01DEA01BED9@dragondata.com> <5267B97C-ED47-4AAB-8415-12D6987E9371@gmail.com> <47975CEB-EA50-4F6C-8C47-6F32312F34C4@dragondata.com> <23E6691A-F30C-4731-9F78-FD8ADDDA09AE@gmail.com>
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On Jan 30, 2013, at 10:34 AM, Nikolay Denev <ndenev@gmail.com> wrote: >>=20 >> vfs.zfs.arc_meta_limit: 8199079936 >> vfs.zfs.arc_meta_used: 13965744408 >>=20 >> Full output of zfs-stats: [=85snipped=85] >=20 > Looks like you can try to increase arc_meta_limit to be let's say : = half of arc_max. (16398159872 in your case). >=20 >=20 Okay, will give this a shot on the next reboot too. Does anyone here understand the significance of "used" being higher than = "limit"? Is the limit only a suggestion, or are there cases where = there'a certain metadata that must be in arc, and it's particularly = large here? -- Kevin
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