Date: Thu, 17 Jan 2019 05:35:05 +0000 From: Steve O'Hara-Smith <steve@sohara.org> To: byrnejb@harte-lyne.ca Cc: freebsd-questions@freebsd.org Subject: Re: Memory usage appears a bit high Message-ID: <20190117053505.cd2322c53eb451bfafb1f039@sohara.org> In-Reply-To: <8f1f1f6c5532a9b076d878ff98a9044c.squirrel@webmail.harte-lyne.ca> References: <35c451bc1733004b7d868f60da68c639.squirrel@webmail.harte-lyne.ca> <20190116173621.9d90157c1adf526298763415@sohara.org> <0c45ab67b1480d39dd87059495f6a27c.squirrel@webmail.harte-lyne.ca> <20190116181146.375e2358d2091380c74a8291@sohara.org> <8f1f1f6c5532a9b076d878ff98a9044c.squirrel@webmail.harte-lyne.ca>
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On Wed, 16 Jan 2019 15:45:08 -0500 "James B. Byrne" <byrnejb@harte-lyne.ca> wrote: > As I have never meddled with the sysctl settings on this bhyve host I > infer that this setting in sysctl is calculated based on the total > memory allocated when the vm is created: > > vfs.zfs.arc_max: 3043799040 Which is probably fine if the server isn't doing anything else that demands much memory. > How much should be committed to arc in a 4GB system? What are the > benefits / costs of more or less ram allocated to arc? The more RAM in the ARC the better the caching and therefore (with a cache friendly workload) the faster the filesystem and the lower the rate of wear on the drives. The downside - the ARC is wired so you need to assess how much RAM the server needs for other tasks and throttle the ARC to suit. -- Steve O'Hara-Smith | Directable Mirror Arrays C:\>WIN | A better way to focus the sun The computer obeys and wins. | licences available see You lose and Bill collects. | http://www.sohara.org/
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