Date: Mon, 16 May 2022 10:37:53 -0400 From: Michael Wayne <freebsd07@wayne47.com> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Cc: Mark Millard <marklmi@yahoo.com> Subject: Re: Can not build kernel on 1GB VM Message-ID: <20220516143753.GY72471@post.wayne47.com> In-Reply-To: <27171A11-13B1-48A8-AF46-605091E1093F@yahoo.com> References: <27171A11-13B1-48A8-AF46-605091E1093F.ref@yahoo.com> <27171A11-13B1-48A8-AF46-605091E1093F@yahoo.com>
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More info. I am running UFS so the ZFS should not be an issue % pstat -s Device 1K-blocks Used Avail Capacity /dev/md99 1048576 0 1048576 0% % df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/ufs/rootfs 25388500 17630840 5726580 75% / devfs 1 1 0 100% /dev On Sat, May 14, 2022 at 08:02:29AM -0700, Mark Millard wrote: > The way to know if out of swap might actually be involved > in the context are some other messages that do not of > themselves announce kills: > > swap_pager: out of swap space > swp_pager_getswapspace(. . .): failed > > If you are getting either of those 2, then you are actually > running out of swap space. Otherwise you are not. I am not getting either of those. Watching swap as ctfmerge runs up confirms that I am likely not running out of swap. Note also that I continue to run a kernel built with the suggested patch to /sys/vm/vm_pageout.c > If you are not the real reason is one of 4: Likely the swap device isn't responding within a "reasonable" time. (from another mail in this chain) > FYI: > > kernel: swap_pager: indefinite wait buffer: bufobj: . . ., blkno: . . ., size: . . . > > is for a swap read taking over 20 seconds (including > time when queued but waiting in the queue to start > the transfer). I got this message on 12.1. I am not getting it on 12.3 > /boot/loader.conf can use the likes of: > > vm.pageout_oom_seq=120 > vm.pfault_oom_attempts=-1 > #vm.pfault_oom_attempts= 3 > #vm.pfault_oom_wait= 10 > > I do not know if you have tried any of these. Quoting one of my old emails: On 12.1 I used sysctl to set > vm.pageout_oom_seq=120 > vm.pfault_oom_attempts=-1 > > There was no improvement. I still see processes getting killed due > to no swap space despite only 7-8 MB being reported used. It sorta > feels like it's not really able to use swap at all. > > Note that everything worked fine on 11.x, this is a new issue on 12. I have not tried this on 12.3, nor have I tried the other two. Will do.
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