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Joined: Wed Oct 19, 2011 7:38 am

Problems with queues / Error 105 no buffer space available

Fri Oct 28, 2011 9:56 am

Hello IT team!
Could you please help me with configuration of MikroTik. I’m beginner at ISP and with MikroTik Router OS. So, I have got configuration:
- MikroTik Router OS v5.0
- PC x86, CPU 3800 Mhz, RAM 256 Mb
- ~300 PPPoE clients online
- 9 tariffs (1,2,3,4,5,6,7,8 Mbit/s,512Kbit/s)

I have configured mangles, queues. I don’t use “Simple queue”.

add action=mark-connection chain=forward disabled=no dst-address-list=\
    PPPoE-1M new-connection-mark=PPPoE-1M-Download-Con passthrough=yes \
add action=mark-packet chain=forward connection-mark=PPPoE-1M-Download-Con \
    disabled=no new-packet-mark=PPPoE-1M-Download passthrough=no
The same for other tariffs.

Queue types (i chose PCQ and my rule like pcq-total-limit= (pcq-limit=40 packets) * (amount of online clients of tariffs 1Mbit):
add kind=pcq name=PCQ-1M-Download pcq-burst-rate=0 pcq-burst-threshold=0 \
    pcq-burst-time=10s pcq-classifier=dst-address pcq-dst-address-mask=32 \
    pcq-dst-address6-mask=64 pcq-limit=40 pcq-rate=1024k \
    pcq-src-address-mask=32 pcq-src-address6-mask=64 pcq-total-limit=2800
The same for other tariffs, only pcq-rate and pcq-total-limit are different accordingly.

Queue tree:
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 \
    max-limit=0 name=PPPoE-1M-Download packet-mark=PPPoE-1M-Download parent=\
    Download priority=2 queue=PCQ-1M-Download
My problem is: when ~300 PPPoE clients online (~70 sub-streams for each tariffs 1,2,3 Mbit/s and some other sub-streams for other tariffs). ~800 queued packets for all queues. All clients have problems with opening web pages, ping, It looks like very big delay.
Then I try Tools-Ping, choose IP address of PPPoE client and see error “105 no buffer space available”.
CPU load ~40%, RAM use ~50Mb.

If I turn off all queues, everything works well. Please tell me how to configure the queues? Probably, every client must has own queue, mangle. Or hardware is slow.

Thanks in advance!
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Posts: 140
Joined: Sat Jul 11, 2009 4:36 pm
Location: Cordoba - Argentina

Re: Problems with queues / Error 105 no buffer space availab

Wed Dec 14, 2011 6:35 pm

no one had thiis problem? I'm having the same issue with RouterOS 5.7 with ~ 300 pppoe-clients in simple queue each one.


Ing. Mario D. Clep
CTO - MKE Solutions
MikroTik Certified Trainer
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Topic Author
Posts: 3
Joined: Wed Oct 19, 2011 7:38 am

Re: Problems with queues / Error 105 no buffer space availab

Thu Dec 15, 2011 7:05 am


I guess my problem is network card. First Intel PRO 1000. Second Realtek. I'm going to try install Intel PRO/1000 PT Dual Port Server Adapter.
I will keep you updated.

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