Re: [B.A.T.M.A.N.] i found time delay is very high and there are more caution info , if possible , please give me some advisement

Re: [B.A.T.M.A.N.] i found time delay is very high and there are more caution info , if possible , please give me some advisement

[Linus Lüssing]

On Fri, Oct 21, 2016 at 04:31:20PM +0200, johnzeng via B.A.T.M.A.N wrote:
> Date: Fri, 21 Oct 2016 22:31:00 +0800
> From: johnzeng <johnzeng2013@yahoo.com>
> To: b.a.t.m.a.n@lists.open-mesh.org
> Subject: i found time delay is very high and there are more caution info  ,
>  if possible , please give me some advisement

If I remember correctly, then one typical issue for Arch Linux
users was, that Arch compiles batman-adv with network-coding, even
though it is marked as "Experimental". And that introduces high latency
and/or packetloss.

johnzeug, can you check whether network coding is enabled or
disabled and if it is enabled, whether disabling helps?

(batctl nc disable)

And like Sven asked, what batman-adv version are you using. Not
that long ago the network coding default was changed to disabled
by default even if the module is compiled with NC. Maybe you run
an older batman-adv release?

Regards, Linus

i found time delay is very high and there are more caution info , if possible , please give me some advisement

[johnzeng]

-----------------------------
archlinux hostA
_____________________________

ip link set mtu 1532 dev eth0
batctl if add eth0
ip link set up dev eth0
ip link set up dev bat0

ifconfig bat0 10.10.130.88 netmask 255.255.255.0 up



-----------------------------
archlinux hostB
_____________________________

ip link set mtu 1532 dev eth0
batctl if add eth0
ip link set up dev eth0
ip link set up dev bat0

ifconfig bat0 10.10.130.66 netmask 255.255.255.0 up


my problem is :

when i try to ping hostB from hostA

i found time delay is very high and there are more caution info


because i tested between ethernet network port ( i don't test in wifi
port ) , whether it will master reason ?

ethernet network use csma/cd ,but wifi use csma/ca , and ethernet
network haven't mode ad-hoc .


if possible , please give some advisement .


Thanks again

Re: [B.A.T.M.A.N.] i found time delay is very high and there are more caution info , if possible , please give me some advisement

[Sven Eckelmann]

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On Freitag, 21. Oktober 2016 22:31:00 CEST johnzeng wrote:
[..] 
> my problem is :
> 
> when i try to ping hostB from hostA
> 
> i found time delay is very high and there are more caution info

* What means high?
* What would not be high?
* What kind of "caution" info?
* Did you try to disable offloading for your ethernet chip via ethtool?
* Are these two devices directly connected via cable or is there some
  kind of device in the middle (like a switch/firewall/...)?
* What batman-adv version are you using?
* Did you check the packets sent via eth0 on both ends with wireshark 2.x?

> because i tested between ethernet network port ( i don't test in wifi
> port ) , whether it will master reason ?

Should not be the "reason". batman-adv doesn't care much about it. It just
requires an ethernet compatible device. The re-broadcast is a little bit
less aggressive on non-wifi devices but this has nothing to do with your
problem.

Kind regards,
	Sven


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