Date: Wed, 21 Sep 2016 12:19:23 +0200 From: =?utf-8?B?U3TDpWxl?= Kristoffersen <staale@kristoffersen.ws> To: Michael Schuster <michaelsprivate@gmail.com> Cc: freeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: Server gets a high load, but no CPU use, and then later stops respond on the network Message-ID: <20160921101923.GC13386@putsch.kolbu.ws> In-Reply-To: <CADqw_gLiL=RDmdfOpr5Y-eWqzjDJmvhAvfTR8mc9bWQa8Kungg@mail.gmail.com> References: <20160913232351.GA36091@putsch.kolbu.ws> <CADqw_gLiL=RDmdfOpr5Y-eWqzjDJmvhAvfTR8mc9bWQa8Kungg@mail.gmail.com>
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On 2016-09-21 at 09:35, Michael Schuster wrote: > Hi, > > While I'm not very familiar with FreeBSD internals, I'd like to point out > two things that I think may be relevant: > > 1) note that '[idle]' seems to be the only thread/process doing significant > work - at a guess, I'd say that's the kernel doing work that cannot be > ascribed to anything else ... housekeeping? (someone who knows FreeBSD > better will have to answer that) Hi, I would think those other houskeeping tasks would show up as other kernel threads, but I might be wrong. <snip> > 2) look at 'sr' (using a fixed-width font probably helps). In Solaris > (which is where I come from ... a long time ago ;-)) this is "scan rate", > ie the number of pages (per second) the paging mechanism is looking at - > (again on Solaris) this would mean that your system is under some kind of > fairly constant memory pressure - where from I cannot even guess, and given > the "avm" and "fre" columns, this does look very strange ... but that's > what I'd continue my investigation with. That also had my attention, but the number is much lower than it is when the system is working fine, so I didn't look any harder at it. Can anyone else chime in on what is normal? -- Ståle Kristoffersen
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