Date: Tue, 14 Jul 2015 17:19:26 +0930 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: Karl Denninger <karl@denninger.net>, freebsd-stable@freebsd.org Subject: Re: FreeBSD 10.1 Memory Exhaustion Message-ID: <55A4BF06.4060505@ShaneWare.Biz> In-Reply-To: <55A3F9E1.9090901@denninger.net> References: <CAB2_NwCngPqFH4q-YZk00RO_aVF9JraeSsVX3xS0z5EV3YGa1Q@mail.gmail.com> <CAJ-Vmom58SjgOG7HYPE4MVaB=XPaEkx_OTYgvOTHxwqGnTxtug@mail.gmail.com> <55A3F9E1.9090901@denninger.net>
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On 14/07/2015 03:18, Karl Denninger wrote: > The ARC is supposed to auto-size and use all available free memory. The > problem is that the VM system and ARC system both make assumptions that > under certain load patterns fight with one another, and when this > happens and ARC wins the system gets in trouble FAST. The pattern is > that the system will start to page RSS out rather than evict ARC, ARC > will fill the freed space, it pages more RSS out..... you see where this > winds up heading yes? > Something I noticed was that vfs.zfs.arc_free_target is smaller than vm.v_free_target on my desktop with 8GB I get vfs.zfs.arc_free_target: 14091 vm.v_free_target: 43195 Doesn't that cause arc allocation to trigger swapping leaving space for arc allocation.... -- FreeBSD - the place to B...Storing Data Shane Ambler
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