From owner-freebsd-arm@freebsd.org Tue Jul 31 23:18:58 2018 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3D2991067EF9 for ; Tue, 31 Jul 2018 23:18:58 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (www.zefox.net [50.1.20.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "www.zefox.org", Issuer "www.zefox.org" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id ABD8382E1B for ; Tue, 31 Jul 2018 23:18:57 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (localhost [127.0.0.1]) by www.zefox.net (8.15.2/8.15.2) with ESMTPS id w6VNJD5q095948 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 31 Jul 2018 16:19:13 -0700 (PDT) (envelope-from fbsd@www.zefox.net) Received: (from fbsd@localhost) by www.zefox.net (8.15.2/8.15.2/Submit) id w6VNJCgI095947; Tue, 31 Jul 2018 16:19:12 -0700 (PDT) (envelope-from fbsd) Date: Tue, 31 Jul 2018 16:19:12 -0700 From: bob prohaska To: Mark Millard Cc: "Rodney W. Grimes" , freebsd-arm@freebsd.org, bob prohaska Subject: Re: RPI3 swap experiments Message-ID: <20180731231912.GF94742@www.zefox.net> References: <20180731153531.GA94742@www.zefox.net> <201807311602.w6VG2xcN072497@pdx.rh.CN85.dnsmgr.net> <20180731191016.GD94742@www.zefox.net> <23793AAA-A339-4DEC-981F-21C7CC4FE440@yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <23793AAA-A339-4DEC-981F-21C7CC4FE440@yahoo.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Jul 2018 23:18:58 -0000 On Tue, Jul 31, 2018 at 01:49:57PM -0700, Mark Millard wrote: > On 2018-Jul-31, at 12:10 PM, bob prohaska wrote: > > > > Some weeks (months?) ago there was a thread about swap being broken. Was > > that in any way related to what I'm seeing? > > There was some ZFS context stuff that seemed to be independent of > UFS stuff relative to memory use. I continue to see reports tied > to ZFS contexts. > > But I'm not sure if this is in any way related to what you are > calling "swap being broken". I do not remember anything about > swap being directly broken for swap partitions. (Swap files are > a different issue and are problematical.) > The thread I'm referring to starts with https://lists.freebsd.org/pipermail/freebsd-current/2018-June/069728.html and titled " swapping is completely broken in -CURRENT r334649? " There's no mention whether ARM is affected, just "certain hardware". It looks like a bug was introduced in r329882 and fixed in r334752. Workarounds suggested include sysctl vm.pageout_update_period=0 and sysctl vm.pageout_update_period=1000. Maybe the first will turn OOMA off, and the second delay it? On RPi the value is 600. The one correspondent who tried 1000 said it didn't help, maybe zero is a better guess. For me it's a shot in total darkness either way 8-) Thanks for reading! bob prohaska