After upgrade from 6.19 to 6.21.1 cpu usage increased from ~10% to ~80%
\
system resource print
uptime: 3d23h45m45s
version: 6.21.1
build-time: Nov/03/2014 15:20:56
free-memory: 80.7MiB
total-memory: 128.0MiB
cpu: MIPS 74Kc V4.12
cpu-count: 1
cpu-frequency: 600MHz
cpu-load: 100%
free-hdd-space: 107.7MiB
total-hdd-space: 128.0MiB
write-sect-since-reboot: 155154
write-sect-total: 5224773
bad-blocks: 0%
architecture-name: mipsbe
board-name: RB2011UAS-2HnD
platform: MikroTik
run tool profiler and see which process is using CPU.
/tool profile
NAME CPU USAGE
wireless all 0.5%
ethernet all 0.5%
console all 83.5%
ssh all 0%
firewall all 1%
networking all 1%
ipsec all 0%
logging all 2.5%
encrypting all 0%
management all 6%
profiling all 4.5%
queuing all 0%
bridging all 0%
unclassified all 0.5%
And console crashes from time to time:
Console has crashed; please log in again.
Connection to . closed.
Downgraded to 6.21 no problem so far.
I had unclassified maxing out the cpu and downgrade to 6.20 was the solution for me.
Downgrading to 6.21 not solved problem everywhere.
On 5 routers problem disappeared for now (before downgrade 80% colsole was seen in 1 minute after reboot)
But on one router (same model same config) problem disappeared after reboot but seen again in half hour (rebooted several times)
Downgraded to 6.20 - same problem, downgraded to 6.19 - seems ok for now.
There are almost no client traffic now throught 5 routers? but throgh problem router 500-1000pps, so may have to downgrade all of them tomorrow.