From owner-freebsd-bugs@freebsd.org Mon Jun 17 17:34:06 2019 Return-Path: Delivered-To: freebsd-bugs@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 D2B2415C05B7 for ; Mon, 17 Jun 2019 17:34:05 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 60DA67371B for ; Mon, 17 Jun 2019 17:34:05 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 1FB6015C05B6; Mon, 17 Jun 2019 17:34:05 +0000 (UTC) Delivered-To: bugs@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 F18F015C05B5 for ; Mon, 17 Jun 2019 17:34:04 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 6E9B573718 for ; Mon, 17 Jun 2019 17:34:04 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id BD80F827F for ; Mon, 17 Jun 2019 17:34:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x5HHY35w092897 for ; Mon, 17 Jun 2019 17:34:03 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x5HHXw0S092849 for bugs@FreeBSD.org; Mon, 17 Jun 2019 17:33:58 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 238670] [libkvm][patch] kvm_getswapinfo() returns swap device sizes too small incorrectly Date: Mon, 17 Jun 2019 17:33:13 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 12.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: ota@j.email.ne.jp X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jun 2019 17:34:06 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238670 Bug ID: 238670 Summary: [libkvm][patch] kvm_getswapinfo() returns swap device sizes too small incorrectly Product: Base System Version: 12.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: ota@j.email.ne.jp kvm_getswapinfo() function returns smaller device sizes than the actual swap device sizes configured available. "systat -swap" uses this API and shows problem. "sysctl -c" uses a different API and displays correct sizes. While "usesd" swap device sizes are reported correctly, when a swap device = is used fully, it looks like system haven overwritten next partition. The root of problem is libkvm subtracts vm.dmmax, maximum VOP I/O allowed, = form size of device erroneously. The following shows that 1 MB swap device is prepared, attached, and then f= ully used. Given FreeBSD swap skips 2 4k blocks, 1016 is the correct size avail= able for swapping.=20 # dd if=3D/dev/zero of=3D1MB bs=3D1M count=3D1 1+0 records in 1+0 records out 1048576 bytes transferred in 0.035823 secs (29271150 bytes/sec) # mdconfig -a -t vnode -f 1MB md0 # swapon /dev/md0 # swapctl -l Device: 1024-blocks Used: /dev/ada0s1b 2097144 0 /dev/md0 1016 0 # mount -t tmpfs tmpfs /mnt/tmp # dd if=3D/dev/zero of=3D/mnt/tmp/fill bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 36.267636 secs (57824337 bytes/sec) # swapctl -l Device: 1024-blocks Used: /dev/ada0s1b 2097144 144220 /dev/md0 1016 1016 # systat -swap Disk 1K-blocks Used /0% /10 /20 /30 /40 /50 /60 /70 /80 /90 /= 100 ada0s1b 2097016 144216 XXXX md0 888 1016 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XX 2097904 145232 XXXX --=20 You are receiving this mail because: You are the assignee for the bug.=