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rado3105
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v6.15 only-hardware-queue causes degradation of link

Thu Jul 17, 2014 12:06 am

I tried to chang wireless default to only-hardware-queue on wireless interface with wireless-fp package on nv2 link....but throughoutput was less stable and dropped from 65mbit/s to 45mbit/s...
what is best to use for wireless if I want to use fastpath?
 
uldis
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Re: v6.15 only-hardware-queue causes degradation of link

Thu Jul 17, 2014 11:27 am

fast path is used when you use 802.11 an nv2 wireless protocol with wireless-fp package.
You haven't provided enough information, please tell us more detailed about this wireless link (hardware,configuration, distance, tdma-period-size)
Try to reset the wireless cards configuration and test again.
How are you measuring the speed?
 
rado3105
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Re: v6.15 only-hardware-queue causes degradation of link

Thu Jul 17, 2014 2:25 pm

I cant reset configuration it is in production enviroment.
It is 802.11N, MIMO antennas on both side, on one side rb433ah + r52nM, on other side is sextant, distance is 500m, on both sides about 15 networks. Protocol nv2, v6.15, wireless-fp, tdma auto...

I test it using bandwitch test utility in ros....

what more do you need?
 
WirelessRudy
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Re: v6.15 only-hardware-queue causes degradation of link

Sun Aug 03, 2014 3:52 pm

2 weeks down the road and still no answer? pfff. not very informative this way..... maybe this post reminds uldis....
(Or did you figure it already out yourself?)
 
rado3105
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Re: v6.15 only-hardware-queue causes degradation of link

Sun Aug 03, 2014 10:02 pm

problem still persists...I cant reset wireless link it is in production enviroment....
 
uldis
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Re: v6.15 only-hardware-queue causes degradation of link

Mon Aug 04, 2014 10:50 am

try to set the tdma-period-size to 2 and check if the speed got stable.
Also please upgrade the RouterOS to v6.18
 
WirelessRudy
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Re: v6.15 only-hardware-queue causes degradation of link

Fri Aug 22, 2014 1:54 am

try to set the tdma-period-size to 2 and check if the speed got stable.
Also please upgrade the RouterOS to v6.18
Can you explain why tdma-period-size should be 2? Not so much the number but the explanation why interests my.
I have 95% of my network (+30 routers in either backhaul or AP (wireless) mode) and they all work fine it seems with fastpath and hardware queue on the interfaces.
I only have one rb800 which has one AP radio with 37 clients in a mixed range from 2km up to 8km and here the wireless fp package completely destroys the AP-network.
Since NV2 with its tdma period size and the hardware queue and the fastpath setting all seem to have a relation with each other I am trying to get more in-depth information on why I run into problems with rb800
[And maybe the problem in the rb800 only surfaces because it has by far the most clients connected to one AP radio, that are also have a relative high distance range for these clients that also all are working in single chain mode protocol N with 20Mhz channel width.

I played with several settings, like the tdma-period-size, the channel width (but run into interferences with other AP), fixed or default conn. rates+MCS rates but the only thing to bring the network back to normal again is disabling wireless-fp package to use the normal one again. I made a ticket for this issue but so far no answer... (couple of days now..)

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