Date: Tue, 7 Jul 2020 19:30:34 +0200 From: Gordon Bergling <gbe@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: Allan Jude <allanjude@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: Constant load of 1 on a recent 12-STABLE Message-ID: <20200707173034.GA92732@lion.0xfce3.net> In-Reply-To: <4e38b243-6596-2f88-2df8-2a954ba70a47@FreeBSD.org> References: <20200603101607.GA80381@lion.0xfce3.net> <c18664e8-b4e3-1402-48ed-3a02dc36ce29@freebsd.org> <20200603202929.GA65032@lion.0xfce3.net> <8b1498ea-e343-506e-79c7-c25b594808f0@freebsd.org> <20200604123720.GA63595@lion.0xfce3.net> <20200623072332.GA54653@lion.0xfce3.net> <0a10a722-3eec-456b-d771-97a49af89ad1@FreeBSD.org> <20200705080605.GA53520@lion.0xfce3.net> <4e38b243-6596-2f88-2df8-2a954ba70a47@FreeBSD.org>
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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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