Date: Mon, 03 Aug 2015 03:04:16 -0400 From: Quartz <quartz@sneakertech.com> To: freebsd-fs@freebsd.org Subject: Re: ZFS: Disabling ARC? Message-ID: <55BF1270.10003@sneakertech.com> In-Reply-To: <9DBE58C6-8C42-498B-AB66-7D9BBDFAA90F@kraus-haus.org> References: <55BC14B7.9010009@sneakertech.com> <9DBE58C6-8C42-498B-AB66-7D9BBDFAA90F@kraus-haus.org>
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> If you are really worried about the ARC hogging RAM, then set a cap. > The kernel tunables here are: I'm not worried about it hogging ram per se, but rather I'm a little confused about where and when it helps, where it's useless or detrimental (if ever), and consequently I don't really know when I should tune it or what to tune it *to*. Basically, my question is the subject line of this thread: is there ever a reason to attempt to disable ARC, and what would that situation probably look like? > Please note that I have never seen a _panic_ due to ARC RAM issues, I > have had systems starved for RAM for periods and processes (VMs) get > very angry, but the system as a whole usually recovers. I then > restart the processes that got angry. I didn't mean panics specifically due to ARC, but that in the process of reading various threads about memory related panics and ARC memory issues (separately) I realized that I wasn't really clear about memory management on FreeBSD and how ARC interacted there.
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