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Date:      Fri, 02 Apr 2021 20:29:43 +0000
From:      "Dave Cottlehuber" <dch@skunkwerks.at>
To:        "Mathieu Chouquet-Stringer" <me+freebsd@mathieu.digital>, freebsd-fs <freebsd-fs@freebsd.org>, freebsd-current <freebsd-current@freebsd.org>
Cc:        bryanv@freebsd.org
Subject:   Re: Scrub incredibly slow with 13.0-RC3 (as well as RC1 & 2)
Message-ID:  <3c00c109-ed5a-496c-9339-22b3dc31747a@www.fastmail.com>
In-Reply-To: <YGQ6IyE6B31a6EV0@weirdfishes>
References:  <YFhuxr0qRzchA7x8@weirdfishes> <YF8eL0dmSh6H8HX2@ceres.zyxst.net> <YF9YE282kOWN7ubr@weirdfishes> <YGMq6i%2BUIhNANHXW@weirdfishes> <YGQ6IyE6B31a6EV0@weirdfishes>

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On Wed, 31 Mar 2021, at 09:00, Mathieu Chouquet-Stringer wrote:
> On Tue, Mar 30, 2021 at 03:43:06PM +0200, Mathieu Chouquet-Stringer wrote:
> > 	Hello,
> > 
> > TL;DR: we need kvmclock support in FreeBSD
> 
>   scan: scrub repaired 0B in 12:33:11 with 0 errors on Wed Mar 31 03:33:14 2021
> 
> It's almost twice as fast with kvmclock support...

Does the issue also go away if you use `TSC-slow` ?

I investigated exactly this issue yesterday[1],  and it's great to see Bryan's patch
resurrected, I will try it here and report back too.

[1]: https://hackmd.io/HhYlbsDJTpCWHSwlrwrY_w

A+
Dave



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