Date: Mon, 25 Jun 2018 11:22:50 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Alexander Leidinger <Alexander@leidinger.net> Cc: current@freebsd.org Subject: Re: numa involved in instability and swap usage despite RAM free? Message-ID: <20180625182250.GA40651@troutmask.apl.washington.edu> In-Reply-To: <20180624120329.Horde.HWORumQ7Ng1KAUeviJNtoc3@webmail.leidinger.net> References: <20180624120329.Horde.HWORumQ7Ng1KAUeviJNtoc3@webmail.leidinger.net>
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On Sun, Jun 24, 2018 at 12:03:29PM +0200, Alexander Leidinger wrote: > > I don't have hard evidence, but there is enough "smell" to open up a > discussion... > > Short: > Can it be that enabling numa in the kernel is the reason why some > people see instability with zfs and usage of swap while a lot of free > RAM is available? Interesting observation. I do have NUMA in my kernel, and swap seems to be used instead of recycling freeing inactive memory. Top shows Mem: 506M Active, 27G Inact, 98M Laundry, 2735M Wired, 1474M Buf, 1536M Free Swap: 16G Total, 120M Used, 16G Free Perhaps, I don't understand what is meant by inactive memory. I thought that this means memory is still available in the buffer cache, but nothing is current using what is there. -- Steve
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