Am 29.03.21 um 08:45 schrieb Andrea Venturoli: > On 3/28/21 4:39 PM, Stefan Esser wrote: >> After a period of high load, my now idle system needs 4 to 10 seconds to >> run any trivial command - even after 20 minutes of no load ... > > High CPU load or high disk load? High CPU load, 3 times the number of CPU threads in this particular batch run. Less than 10 files of less than 100 KB per second have been written. > ZFS? Snapshots? ZFS and automatic snapshots of the file system every hour. > 12.x? 13.x? -CURRENT as of some 24 hours before the issue occurred: FreeBSD 14.0-CURRENT #33 main-n245694-90d2f7c413f9-dirty: Sat Mar 27 15:35:37 CET 2021 > I've seen something similar: after a high load period, system crawled so much > that services were not answering in a reasonable time (e.g. mail would fail > with "no such mailbox"!). Program start-up was very slow, but interactive response once running was normal (e.g. execution of internal shell commands like "echo *"). > Even rebooting didn't fix it, until I deleted some autosnapshots. Rebooting fixed it on my case. > top or other tools would show no disk activity, although the disks were working > as mad. No disk activity in my case. The system was idle without any load, but the issue persisted over many hours (up to the moment when I decided to reboot the system to get it back into a usable state). > Not sure it's the same case you experienced, though. Probably not, but you seem to have hit another case were a resource limit was reached and the system did not gracefully deal with the situation. Thanks for replying ... Regards, STefan
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