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exa
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mikrotik kernel question

Thu Sep 15, 2011 4:19 pm

Hello guys,
quick questions:

1] on mikrotik routers, what is the value of sys.net.core.netdev_max_backlog sysctl? (or some equally-working tunable, if mikrotiks have one..)

2] if it exists, is there some good method to increase/decrease it?

Thanks very much :]

-exa
 
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normis
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Re: mikrotik kernel question

Fri Sep 16, 2011 12:51 pm

why do you need this ?
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exa
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Re: mikrotik kernel question

Fri Sep 16, 2011 3:44 pm

because we're trying to fix some packet loss occuring when a router goes under a huge packet load (+80Kp/s) showing up as RX drops, so I miss some kind of such tunable - increasing the ring buffer size usually fixes stuff in such situations (in linux... 8) ).

The closest setting that also (kindof) fixed some stuff for us was to tune the interface queues, but afaik this does a little different thing than we want to achieve.

and well, I'm also pretty curious :D if the value is somehow confidental I don't mind, but I guess it might help in some hi-perf cases.

I also guess there's some other method to fix this, please let me know if you know some :D

Thanks
-exa
 
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normis
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Re: mikrotik kernel question

Fri Sep 16, 2011 4:00 pm

value is 1000 and you can't change it
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martini
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Re: mikrotik kernel question

Fri Sep 16, 2011 10:38 pm

you can change that value, but why ?? 80k pps is not very high !! (you are using RB750 as router ??)
On x86 with Celeron CPU you can get more than 200k pps easy, on core2duo-AMD even much high... Maybe you need to change the router ?
 
exa
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Re: mikrotik kernel question

Fri Sep 16, 2011 11:54 pm

value is 1000 and you can't change it
Nice, thanks very much!

@martini: 80kpps is not very high, but I'm still getting a small but still annoying percent of packet drops.

At least now I have some idea where to start with solving this stuff :]

Thanks again&have a nice day
-exa

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