Hi Dirk Dirk is correct, you need to look at what is called buffer bloat, have a look at https://www.animmouse.com/p/fix-bufferbloat-on-mikrotik-without-disabling-fa... Cheers Mike On 1/3/2024 1:10 pm, Two Fat Monkeys - Dirk Bermingham via Public wrote:
Hi Chris,
There are a few areas to look, particularly your firewall config, also, profile your cpu usage so you can get a picture of what processes are consuming the CPU then we can provide further advice from there. Are you maxing out a core with firewall or networking processes?
The other place to look is queuing, fq-codel can be your best friend in times like these.
Regards,
Dirk
-----Original Message----- From: Public<public-bounces@talk.mikrotik.com.au> On Behalf Of Chris Lee via Public Sent: Friday, March 1, 2024 1:33 PM To: MikroTik Australia Public List<public@talk.mikrotik.com.au> Cc: Chris Lee<chris@datachaos.com.au> Subject: [MT-AU Public] High CPU and latency spike on RB750Gr3 during downloads
Hi all,
Am running RB750Gr3 firmware 7.13.5 with the out of box factory configuration for internet router. I have disabled RSTP on the bridge.
On NBN FTTP 100/40 plan with NTD connected to eth1 on the RB750Gr3.
Rest of my internal LAN is connected to eth2.
When I max out a download or run a speed test at 100Mbps I find the CPU on the HEX is getting up to 30-35%, and on upload around 20-25%.
At the same time I see in all my pings beyond my first hop ISP gateway that I get a big spike in latency which feels like the Mikrotik is struggling to process the traffic inbound.
I thought the RB750Gr3 was good for up to Gigabit speeds, but even then I'm only asking for 100Mbps - is there anything I need to tweak further in the configuration to fix this or should I be looking at a newer router like the L009 series, will that provide smoother throughput ?
Thanks, Chris _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
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