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List:       freebsd-hackers
Subject:    Re: Constant load of 1 on a recent 12-STABLE
From:       Gordon Bergling <gbe () freebsd ! org>
Date:       2020-07-07 17:30:34
Message-ID: 20200707173034.GA92732 () lion ! 0xfce3 ! net
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Hi Andriy,

On Sun, Jul 05, 2020 at 02:39:38PM +0300, Andriy Gapon wrote:
> On 05/07/2020 11:06, Gordon Bergling wrote:
> > I didn't use the ZFS multi-modifier protection feature and didn't have the 'multihost'
> > propery set on any of my 3 ZFS pools. Thanks for identifing the particular change. I
> > have tried OpenZFS from ports, which seems to improve the situation, but I went back
> > to the base version since only the zroot pool was found and the two others pools 
> > weren't detected.
> 
> You can try to use dtrace or hwpmc or some such to see what those mmp threads
> are doing.

I filed a PR [1] for the issue. I already worked my way through the dtrace one-liners
on the wiki, but I wasn't that successful on getting an insight into what ever the
mmp threads were doing.

I'll try to attend the upcoming Bug Squash Hackathon and work on that issue.

--Gordon

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247829
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