Date: Mon, 2 Mar 2020 19:36:51 +0000 From: tech-lists <tech-lists@zyxst.net> To: freebsd-questions@freebsd.org Subject: Re: swap_pager: indefinite wait buffer Message-ID: <20200302193651.GA58645@bastion.zyxst.net> In-Reply-To: <48Sr7X6M0Lz1ftWZ@baobab.bilink.it> References: <48Sr7X6M0Lz1ftWZ@baobab.bilink.it>
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--tKW2IUtsqtDRztdT Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello, On Thu, Feb 27, 2020 at 12:29:39PM +0100, Luciano Mannucci wrote: > >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 I also see this - 12.1-stable r358260 and the load it happens with is poudriere, but it'll only happen when building the largest packages. I have= to re-run the poudriere run. It'll eventually complete. >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% I also use a swapfile, but as well as that I have a 4GB swap partition. I've had the swapfile up to 32GB and it still happens. If I turn off the swapfil= e, the swap partition will fill up leading to out-of-swapspace errors. The indefinite-wait-buffer messages only happen with a swapfile. >Is there something I should check? >Any kernel variables tunable via sysctl? I haven't found a fix for this yet. I was thinking of reinstalling the syst= em but this time making a 32GB partition for swap (and dispensing with the swapfile). I would have hoped that a swapfile could be used just like a swap partition but alas it seems not. There are vm_swap tunables in sysctl but I have no idea what they do and, as far as I can tell, appear not to be documented. --=20 J. --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEE8n3tWhxW11Ccvv9/s8o7QhFzNAUFAl5dYGUACgkQs8o7QhFz NAVYYA/9ELgFqqS4S0A3mONqhrJWXgct2XccLFvQ08OlmZ3f/7KIa0/HPJ6ahaBR PhB47BYNwR9OeUQi+TRHE4tRB4hMBue0zvWqWCNO07iixPn36kj81DQXIdAx8aBM A59bbChmE+VNfKQkdnIOY+Q/Rv3NMswx5BpjpBUOtCI0fdjrVT3riCcG/Yg268Z3 QyOCtydFIK7m+FdmF4yves5MskmebtS9OUhuyhzUNUxkGDXngwvG9A/bZq9MA9/z icOmIZ35sHPM87EVBtEe/4jhkWB9vXZSReejnVVcz97ATJVzLHuX8Yi8VWvOdes1 5hkH+yQiye6sgR/NbkShdeD8snZjUOkOkS68uy8Is2VhH8Pl44CT36lLCSvAJFwy MT1qp2HT/AVeOxRQshFkqEbue7WG8fyfnvIfbFXi/AugzXj1bWoxWT7mADirXRxr gKsIAYVE2yuW2igjE21oVoa7vO/S2gZ44LswzwdkrRFzAfFxOju1SFEgs++s1rTF oAvghoCuZ7+ItMsxpZDdRcF73oIDR1A6/TG5fo2/1cGuYroRyrecVpcLiNamjhnS qrZzVliAwf5gCBPmj/HCKdP4eeszuNXJAHiqxuOI+CGsCgb0blcQm776STMJJSik i3YE1LRkwiJAxVLQL+xurwefbXO9c3xrHgz3WUOlQ2lX5spspag= =0uG3 -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--
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