From owner-freebsd-virtualization@freebsd.org Thu Mar 5 11:14:51 2020 Return-Path: Delivered-To: freebsd-virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 73D4E265ACB; Thu, 5 Mar 2020 11:14:51 +0000 (UTC) (envelope-from luciano@vespaperitivo.it) Received: from baobab.bilink.net (baobab.bilink.net [212.45.144.44]) by mx1.freebsd.org (Postfix) with ESMTP id 48Y7ST2bz1z3DDl; Thu, 5 Mar 2020 11:14:48 +0000 (UTC) (envelope-from luciano@vespaperitivo.it) Received: from baobab.bilink.net (localhost [127.0.0.1]) by baobab.bilink.it (Postfix) with ESMTP id 48Y7SR2Vsdz1ftWh; Thu, 5 Mar 2020 12:14:47 +0100 (CET) Received: from hermes.mcs.it (hermes.mcs.it [192.168.132.21]) by baobab.bilink.it (Postfix) with ESMTP id 48Y7SR1lPHz1ftWg; Thu, 5 Mar 2020 12:14:47 +0100 (CET) Received: from mordeus (unknown [192.168.45.6]) by hermes.mcs.it (Postfix) with ESMTP id CB03D4D5D77; Thu, 5 Mar 2020 12:14:46 +0100 (CET) Date: Thu, 5 Mar 2020 12:14:34 +0100 From: Luciano Mannucci To: freebsd-questions@freebsd.org Cc: freebsd-virtualization@freebsd.org Subject: Re: swap_pager: indefinite wait buffer (solved?) In-Reply-To: <48Sr7X6M0Lz1ftWZ@baobab.bilink.it> References: <48Sr7X6M0Lz1ftWZ@baobab.bilink.it> X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Face: 4qPv4GNcD; h<7Q/sK>+GqF4=CR@KmnPkSmwd+#%\F`4yjKO3"C]p'z=(oWRnsYBQGM\5g:4skqQY0NnV'dM:Mm:^/_+I@a"; [-s=ogufdF"9ggQ'=y MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-Id: <48Y7SR1lPHz1ftWg@baobab.bilink.it> X-Virus-Scanned: PippoLillo, ClamAV using ClamSMTP X-Rspamd-Queue-Id: 48Y7ST2bz1z3DDl X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of luciano@vespaperitivo.it designates 212.45.144.44 as permitted sender) smtp.mailfrom=luciano@vespaperitivo.it X-Spamd-Result: default: False [-5.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.991,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:212.45.144.0/24]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[vespaperitivo.it]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_COUNT_THREE(0.00)[4]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[44.144.45.212.list.dnswl.org : 127.0.10.0]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:8816, ipnet:212.45.128.0/19, country:IT]; IP_SCORE(-2.81)[ip: (-8.07), ipnet: 212.45.128.0/19(-4.03), asn: 8816(-1.96), country: IT(0.03)]; SUBJECT_HAS_QUESTION(0.00)[] X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 11:14:51 -0000 On Thu, 27 Feb 2020 12:30:06 +0100 Luciano Mannucci wrote: > In the daily security report of one of my PPC 64 virtual server, that > runs under KVM/Qemu, which says: > > Feb 26 20:17:53 Saguaro kernel: swap_pager: indefinite wait buffer: bufobj: > 0, blkno: 1698063, size: 20480 The issue started just after adding 4 virtual CPUs to the machine. Adding more ram solved the issue. I had 4 CPUs 8 Gig, problem raised with 8 CPUS 8 Gig, now I have 8 CPUs and 12 Gigs - no problem: the machine swaps a bit, but no errors. There might be a small bug in the kernel, but I think it is not worth the investigation for a 11.3 release. Or maybe in qemu fake scsi api... In any case, the discussion should belong to virtualization mailing-list. Sorry for the noise, Luciano. -- /"\ /Via A. Salaino, 7 - 20144 Milano (Italy) \ / ASCII RIBBON CAMPAIGN / PHONE : +39 2 485781 FAX: +39 2 48578250 X AGAINST HTML MAIL / E-MAIL: posthamster@sublink.sublink.ORG / \ AND POSTINGS / WWW: http://www.lesassaie.IT/