Large file copying to my NAS kills Wifi and LAN for all other home users

RouterOS General
1

My setup:
hAP ac² mostly default config with some minor changes (port forward etc.).
All PCs and NAS connected either directly or via unmanaged switch. NAS is connected via switch.

If I copy a big file to my NAS (PC → hAP ac² → switch → NAS) it freezes all other network traffic. No matter if other home users are connected to LAN or Wifi - network stops for everybody.

When that happens:

  • hAP ac² CPU usage is barely at 4%.


  • Speedtest from the PC to the internet - 700Mbps and more. So it doesn’t impact network on the PC from which I do file copying.

Where should I start looking at?
Thanks!

2

First you have to diagnose what exactly means “freezes all other network traffic”. Obviously that’s not exactly the case as your own observation goes: you can still get very decent throughput from your PC to internet (or is it the other way around?). Think about all support services that a network client needs in order to establish connection with internet server (e.g. DNS). If it actually is about throughput, find exact choke point (can be the switch or NAS, or connection between router and switch). If CPU load on hap ac2 is 4%, then it doesn’t seem to be the problem (even if whole CPU load was on single logical CPU, hap ac2 has 4 cores, it would still be only 16% loaded).

3

/tool/profile

4

I had exactly same issue at customer with same rotuer and qnap nas, actual ports would go down while you copy files(other ones that don’t copy traffic) ,sent mikrotik support logs and they told me I’m not suposed to use it as switch, like Wtf mikrotik ?
And issue persisted from v6 to most recent v7 rotueros.
Issue also was repeatable with fully fresh reset and empty config, just all ports bridged…
Recently we replaced it with HAP AX3 and now all works fine..

5

Thanks.
So looks like this is a known issue and can be replicated.
Too bad I’m not planning any updates soon. And hAP AX3 doesn’t tempt me. Unless it brought not only Wifi6 but 2.5G as well.

6

Well looks like I’m not the only one with that problem.

7

Have not heard that such issue is “known”.

Try this:

  1. in Queues menu, go to Queue Types
  2. add new, select type “cake”, type any name for it, and leave everything else to default, click OK
  3. go to interface queues tab and set all interfaces to the new cake type

see if this makes any difference

8

Thanks normis.
Made changes as you suggested, quickly tested - so far so good.
But let’s see how it will perform during normal conditions (many users actively doing something, gaming, watching IPTV) while files are being copied from/to NAS.

Have a nice day!!!

9

Looks like this didn’t solve my problem.
Did some extensive tests with cake Queue set to all interfaces (except default Bridge; couldn’t set it).
Still network stops for everybody (LAN and WAN) during file copying between PC and NAS.

Any ideas what to do next?