Date: Thu, 1 Dec 2011 13:58:18 +0000 From: RW <rwmaillists@googlemail.com> To: freebsd-hackers@freebsd.org Subject: Re: Invalid memory stats from vmstat and sysctl vm.vmtotal? Message-ID: <20111201135818.641625c5@gumby.homeunix.com> In-Reply-To: <547298A3C38F407887E1AAAAC487DF6D@multiplay.co.uk> References: <547298A3C38F407887E1AAAAC487DF6D@multiplay.co.uk>
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On Wed, 30 Nov 2011 12:39:10 -0000 Steven Hartland wrote: > We're seeing some impossible memory usage stats reported on machines > here from vmstat and sysctl vm.vmtotal. > > We have machines reporting to be using 31GB total when they only have > 8GB physical and are not using any swap. > > Here's an output from one of our machines:- > vmstat -c 2 -w 1 -n 0 > procs memory page faults cpu > r b w avm fre flt re pi po fr sr in sy cs us > sy id 0 0 0 31768M 2112M 586 0 0 0 421 0 106 270 > 569 0 6 94 0 0 0 31768M 2112M 2 0 0 0 0 0 370 > 8139 3996 0 1 99 > > ... > It looks like it may be out by a factor of 4, possibly due to the fact > the its a 4k page size not 1k as indicated by the vmstat man page:- > I don't think so, I have 16GB and tops shows: Mem: 817M Active, 396M Inact, 1364M Wired, 82M Cache, 1282M Buf, 13G Free but vmstat -c 2 -w 1 -n 0 procs memory page faults cpu r b w avm fre flt re pi po fr sr in sy cs us sy id 0 0 0 9750M 13G 450 5 3 1 560 0 234 50201 5206 2 2 96 1 0 0 9742M 13G 79 4 0 0 573 0 239 51886 4700 0 1 99
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