Date: Wed, 24 Mar 2021 12:30:52 GMT From: Martin Simmons <martin@lispworks.com> To: Mathieu Chouquet-Stringer <me+freebsd@mathieu.digital> Cc: freebsd-fs@freebsd.org Subject: Re: Scrub incredibly slow with 13.0-RC3 (as well as RC1 & 2) Message-ID: <202103241230.12OCUqur030001@higson.cam.lispworks.com> In-Reply-To: <YFm3BTK/J9XY/mCN@weirdfishes> (message from Mathieu Chouquet-Stringer on Tue, 23 Mar 2021 10:38:13 %2B0100) References: <YFhuxr0qRzchA7x8@weirdfishes> <202103221515.12MFFHRK015188@higson.cam.lispworks.com> <YFi6Lwh3ISn8UMvS@weirdfishes> <YFk11A/j7URClN/l@weirdfishes> <YFm3BTK/J9XY/mCN@weirdfishes>
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>>>>> On Tue, 23 Mar 2021 10:38:13 +0100, Mathieu Chouquet-Stringer said: > > So it's better but still not great, it's been running for 9.5 hours now: > > scan: scrub in progress since Tue Mar 23 01:03:09 2021 > 3.90T scanned at 121M/s, 3.90T issued at 121M/s, 24.5T total > 0B repaired, 15.93% done, 2 days 01:24:58 to go > > For reference I had the following after 12 hours with the new scrub algorithm: > > scan: scrub in progress since Sun Mar 21 23:47:40 2021 > 2.82T scanned at 77.8M/s, 2.24T issued at 62.0M/s, 24.5T total > 0B repaired, 9.17% done, 4 days 08:23:32 to go FWIW, I think the new scrub algorithm was added in 2018. You could try to profile it: https://wiki.freebsd.org/DTrace/Tutorial#Lesson_9._Profile_On-CPU_Kernel_Stacks __Martin
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