From owner-freebsd-arm@freebsd.org Thu Nov 12 17:12:27 2015 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CAEAAA2C6E9 for ; Thu, 12 Nov 2015 17:12:27 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5EAEC12ED; Thu, 12 Nov 2015 17:12:27 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kostik@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id tACHCMgC027104 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Thu, 12 Nov 2015 19:12:22 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua tACHCMgC027104 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id tACHCLlI027103; Thu, 12 Nov 2015 19:12:21 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 12 Nov 2015 19:12:21 +0200 From: Konstantin Belousov To: Michael Tuexen Cc: freebsd-arm Subject: Re: Memory management issue on RPi? Message-ID: <20151112171221.GO2257@kib.kiev.ua> References: <20151112121825.GJ2257@kib.kiev.ua> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Nov 2015 17:12:27 -0000 On Thu, Nov 12, 2015 at 05:25:37PM +0100, Michael Tuexen wrote: > > On 12 Nov 2015, at 13:18, Konstantin Belousov wrote: > > This is a known problem with the swap-less OOM. The following patch > > should give you an immediate relief. You might want to tweak > > sysctl vm.pageout_oom_seq if default value is not right, it was selected > > by 'try and see' approach on very small (32 or 64MB) i386 VM. > It just works... Will do some more testing... I am more interested in report if OOM was triggered when it should. Try running several instances of 'sort /dev/zero'.