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rmichael
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Broken SFQ

Tue Oct 02, 2012 5:40 pm

When I assign SFQ to my upload traffic with sfq-allot=1 the queue is not dropping packets and all flows continue. Since there are no packets of 1 byte in size - all traffic should just stop but that is not the case. I see three possibilities: either SFQ allot parameter has no meaning below 1514, SFQ is broken or in fact it's actually DRR.

Does anyone know what is going on?
 
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Re: Broken SFQ

Sun Oct 07, 2012 4:05 pm

RouterOS version, screenshot and what do you mean DRR?
 
rmichael
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Re: Broken SFQ

Mon Oct 08, 2012 6:11 am

ROS 5.14
DRR = Deficit Round Robin

thanks.
 
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Re: Broken SFQ

Mon Oct 08, 2012 6:56 am

What about 5.20 ?
 
rmichael
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Re: Broken SFQ

Mon Oct 08, 2012 4:03 pm

What about 5.20 ?
There were no change log entries regarding queuing so I assume it's the same. However, since you asked I did test SFQ on a different device running v5.20 with the same result.
 
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Re: Broken SFQ

Mon Oct 08, 2012 4:15 pm

AFAIK for SFQ 'allot' >= 'interface MTU', but this is not mentioned in Wiki.
Try to Google about this.

HTH,
 
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Re: Broken SFQ

Fri Oct 12, 2012 9:27 pm

AFAIK for SFQ 'allot' >= 'interface MTU', but this is not mentioned in Wiki.
Try to Google about this.

HTH,
That's too bad...I could use SFQ with smaller allot values for queues that handle small packets like VoIP, DNS, most ack, etc.
 
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Re: Broken SFQ

Sun Oct 21, 2012 2:36 pm

Why would you put these types of packets into a 128 packet sized queue that gives only sfq-allot bytes of transmission on each RR cycle?

Have you tough of some actually useful benefit of this?
 
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Re: Broken SFQ

Sun Oct 21, 2012 7:02 pm

Why would you put these types of packets into a 128 packet sized queue that gives only sfq-allot bytes of transmission on each RR cycle?

Have you tough of some actually useful benefit of this?
I'm reshuffling packets, not transmitting them yet. As I understand it, NV2 and nstreme decide how many packets go into a frame.
Last edited by rmichael on Sun Oct 21, 2012 10:52 pm, edited 1 time in total.
 
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Re: Broken SFQ

Sun Oct 21, 2012 7:14 pm

Cool man. Let us know if you discover an interesting useful HTB setup. Thank you.

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