On 6/26/20, Peter Jeremy <pe...@rulingia.com> wrote: > On 2020-Jun-25 11:30:31 -0700, Donald Wilde <dwil...@gmail.com> wrote: >>Here's 'pstat -s' on the i3 (which registers as cpu HAMMER): >> >>Device 1K-blocks Used Avail Capacity >>/dev/ada0s1b 33554432 0 33554432 0% >>/dev/ada0s1d 33554432 0 33554432 0% >>Total 67108864 0 67108864 0% > > I strongly suggest you don't have more than one swap device on spinning > rust - the VM system will stripe I/O across the available devices and > that will give particularly poor results when it has to seek between the > partitions.
My intent is to make this machine function -- getting the bear dancing. How deftly she dances is less important than that she dances at all. My for-real boxen will have real HP and real cores and RAM. > > Also, you can't actually use 64GB swap with 4GB RAM. If you look back > through your boot messages, I expect you'll find messages like: > warning: total configured swap (524288 pages) exceeds maximum recommended > amount (498848 pages). > warning: increase kern.maxswzone or reduce amount of swap. Yes, as I posted, those were part of the failure stream from the synth program. When I had kern.maxswzone increased, it got through boot without complaining. > or maybe: > WARNING: reducing swap size to maximum of xxxxMB per unit The warnings were there, in the as-it-failed complaints. > The absolute limit on swap space is vm.swap_maxpages pages but the > realistic > limit is about half that. By default the realistic limit is about 4×RAM > (on > 64-bit architectures), but this can be adjusted via kern.maxswzone (which > defines the #bytes of RAM to allocate to swzone structures - the actual > space allocated is vm.swzone). > > As a further piece of arcana, vm.pageout_oom_seq is a count that controls > the number of passes before the pageout daemon gives up and starts killing > processes when it can't free up enough RAM. "out of swap space" messages > generally mean that this number is too low, rather than there being a > shortage of swap - particularly if your swap device is rather slow. > Thanks, Peter! -- Don Wilde **************************************************** * What is the Internet of Things but a system * * of systems including humans? * **************************************************** _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
