Thanks Mike, I have implemented fq-codel and it's made a huge difference, took a bit of trial and error and working out that the upload/download limits had to be reversed from the point of view of the WAN interface. That said, I am finding a bit of conflicting info on how to best tune it, for instance on the Ubiquiti forums this post below suggests disabling ECN for uploading, but still keeping enabled for downloads. I'm also a bit confused regarding the fq-codel queue configuration, some people suggesting the Quantum should be 300 for up to 100Mbps connections, and 1514 more for 10Gbit connections? Anyone have any suggestions on what they use for a NBN 100/40 connection? I know NBN over-provision the bandwidth slightly and I've had up to 104Mbps on speed tests before, so I've set the upload (really download) maximum to 100M, and for the download (really upload) only seems to kick in queuing if I set it to around 32M, as the best I've ever really gotten in speed tests is around 36Mbps up. https://community.ui.com/questions/Best-Practices-for-Smart-Que-tuning-FQ-Co... Thanks, Chris On Sun, Mar 3, 2024 at 1:25 PM Mike O'Connor via Public < public@talk.mikrotik.com.au> wrote:
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
Hi Chris,
There are a few areas to look, particularly your firewall config, also,
On 1/3/2024 1:10 pm, Two Fat Monkeys - Dirk Bermingham via Public wrote: 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
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
Lee via Public 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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