Hi, On Mon, 18 Jun 2018 13:27:23 +0100 tech-lists <[email protected]> wrote:
> On 18/06/2018 09:08, Erich Dollansky wrote: > > > > On Sun, 17 Jun 2018 23:19:02 +0100 > > tech-lists <[email protected]> wrote: > > > >> freebsd-11-stable r333874, ZFS raidz1-0 (3x4TB disks), 128GB RAM, > >> Swap: 4096M Total, 3502M Used, 594M Free, 85% Inuse > > > > this might not be related but I noticed that your swap space is > > small compared to RAM size. I noticed on a much smaller Raspberry > > Pi, that it runs into trouble when there is no swap even there is > > enough RAM available. Is it easily possible for you to add some GB > > of swap space and let the machine run then? > > > > How much swap do the other machines have? > > Yes, the machine with the problem uses the default 4GB swap. That's > all the swap it has. The machine without issue has a swapfile > installed on a SSD in addition to the default 4GB swap. > > problematic machine: > Device 512-blocks Used Avail Capacity > /dev/ada0p3 8388608 3.3G 714M 83% > > machine without a problem, it has swapfile installed: > Device 512-blocks Used Avail Capacity > /dev/ada0s1b 8262248 1.7G 2.2G 44% > /dev/md0 65536000 1.9G 29G 6% > Total 73798248 3.7G 32G 10% > > I added the swapfile a long time ago on this machine due to the same > issue. so, the same effect as on a small Raspberry. It seems that you also use a memory disk for swap. Mine is backed by a file via NFS. > > But my problem isn't so much an out of swapspace problem; all this > is, is a symptom. My problem is "why is it swapping out at all on a > 128GB system and why is what's swapped out not being swapped back in > again". > I wondered even on the small Raspberry about this. The Raspberries come with 1GB of RAM. Running just a compilation should never be the problem but sometimes it is. A very long time ago - and not on FreeBSD but maybe on a real BSD - I worked with a system that swapped pages out just to bring it back as one contiguous block. This made a difference those days. I do not know if the code made it out of the university I was working at. I just imagine now that the code made it out and is still in use with the opposite effect. Erich _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
