On 22 Nov 2022, at 9:34, Dan Mack wrote: > It disappears a piece at a time - the oldest entries disappear first. > However, it vanishes even when there are only 2-3 lines in it so I didn't > think capacity was in play as I expected. > > So for example I might see a rate-limit entry from someone spamming the > system and then it will usually be gone in a couple days and the buffer is > completely empty. Similarly if I do something like ifconfig em0 down; > ifconfig em0 up ; it's logged but disappears after a day or so. > > I'm looking to see if this is just a cron job or something clearing it as it > might be user-error on my part. Also this is an older system so I'll > probably look at it again after I update.
I noticed this too, but discovered with “dmesg -a” that the buffer was full of syslog messages, so dmesg without -a showed nothing. It seems unfortunate that syslog messages logged in the message buffer, at least once syslogd is running. Apparently this happens because they are output to /dev/console. Mike > Thank you, > > Dan > > > On Tue, 22 Nov 2022, Warner Losh wrote: > >> On Tue, Nov 22, 2022 at 8:13 AM Dan Mack <m...@macktronics.com> wrote: >> >>> It seems like dmesg content ages out over time. Is there a way to leave >>> the contents based on a fixed memory size instead? >>> >> >> It already is a fixed memory size. Do you see it all disappear at once, or >> over time? >> >> Warner >>