Date: Sat, 22 Sep 2018 12:23:06 +0930 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: Mike Tancsa <mike@sentex.net>, Josh Gitlin <jgitlin@goboomtown.com>, freebsd-fs@freebsd.org Subject: Re: Troubleshooting kernel panic with zfs Message-ID: <41d177bf-117b-10c3-06a0-7d74d298fede@ShaneWare.Biz> In-Reply-To: <c4d7e51f-09c9-c50c-075d-8eff65e64abe@sentex.net> References: <D54225AD-CC96-45E7-A203-D2C52E984963@goboomtown.com> <c4d7e51f-09c9-c50c-075d-8eff65e64abe@sentex.net>
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On 21/9/18 10:34 pm, Mike Tancsa wrote: > > Given all the issues with memory pressure perhaps ARC is eating too > much, I would try artificially limiting it so it does not eat up too > much RAM. We had a similar purposed server but with 32G RAM and I found > one day the system was randomly shooting processes to reclaim RAM > > eg > pid xxx (yyy), uid zzzz, was killed: out of swap space > I have seen these errors, for me they came when >90% ram is wired. This is something I reported in bug 229764. While ARC is wired, there is also a max_wired that limits other wired allocations, these two are independent and can total more than physical ram. max_wired defaults to 30% ram, so arc_max should be kept less than 70% I also had positive results applying review D7538 -- FreeBSD - the place to B...Storing Data Shane Ambler
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