Date: Thu, 27 Feb 2020 12:30:06 +0100 From: Luciano Mannucci <luciano@vespaperitivo.it> To: freebsd-questions@freebsd.org Subject: swap_pager: indefinite wait buffer Message-ID: <48Sr7X6M0Lz1ftWZ@baobab.bilink.it>
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Hello everybody! Since my last upgrade (to 11.3-RELASE-p6) I've noticed some messages in the daily security report of one of my PPC 64 virtual servers, 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 (numbers vary, of course) It happens only under heavy IO. I can reproduce this by launching a backup (I use bacula). I moved the swap to cooked files, just in case it was a hardware problem, which gave me only more messages of this kind. I know that the handbook recommends to check hardware & cables, but being on a virtual machine makes it a bit nonsensical. The machine does'nt lack ram, it has 8 CPUs and 8 Gigabytes of ram. This is vmstat: procs memory page disks faults cpu r b w avm fre flt re pi po fr sr md99 md98 in sy cs us sy id 0 0 0 14G 1.2G 687 8 1 0 747 951 0 0 0 1622 704 3 1 95 and swapinfo says: Device 1K-blocks Used Avail Capacity /dev/md99 2097152 420564 1676588 20% /dev/md98 2097152 419352 1677800 20% Total 4194304 839916 3354388 20% Is there something I should check? Any kernel variables tunable via sysctl? Thanks for any answer, 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/
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