[Chilli] Chilli Digest, Vol 63, Issue 14

Thu Feb 26 12:30:33 UTC 2015

Hi Richard,

Try to disable packet off-loading on the Gigabit NIC.

Kind regards,
Claus

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Sendt: 26. februar 2015 13:00
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Emne: Chilli Digest, Vol 63, Issue 14

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Today's Topics:

   1. Re: Chilli Digest, Vol 63, Issue 12 (Richard REY)

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Message: 1
Date: Wed, 25 Feb 2015 22:48:56 +0100
From: Richard REY <richard at rexy.fr>
To: chilli at coova.org
Subject: Re: [Chilli] Chilli Digest, Vol 63, Issue 12
Message-ID: <54EE4348.2090503 at rexy.fr>
Content-Type: text/plain; charset=windows-1252; format=flowed

Hi,
I use COOVA in its last version (SVN revision 492) running on an ALCASAR appliance (mageia 4.1 - kernel 3.14.32), all is OK excepted a flow issue.
When a TCP stream goes across the appliance there isn't any flow issue (forward mode). BUT when a TCP stream is sent inside the appliance (to a HTTP proxy for example) the observed flow is very weak (Input mode). The problem is maximal when the card connected to COOVA is in the Gigabit mode.

Our investigation :
 From the appliance, we try to download a file located on a FTP server connected on the network controlled by COOVA. Without COOVA the observed flow in gigabit mode is about 888Mb/s whereas with COOVA we can see just
68 Kb/s (YES 68 Kb/s). Regarding the packets exchanged we can see ICMP packets sent by the appliance (Destination unreachable (Fragmentation needed).
We found a by-pass ?solution? by fixing the speed of the card to 100Mb/s. At this speed the phenomenon is practically invisible (just one ICMP packet sent) and the flow approaches the maximum supported by the network card. On a virtual machine where we can't fix Ethernet speed, we must choose a 100Mb/s virtual Ethernet card when building the VM.
We have the Pcap file of our investigation. I say it again, this issue is seen only when the TCP flows is sent to an internal processes (in 'forward' mode all is ok).

Regards
Rexy & ALCASAR team

Le 23/02/2015 08:59, kl a ?crit :
> I see problem on kernel version > 3.7 right up to 3.10.  Above 3.10 not tested.
> However, in the other quoted post, it says kernel 2.6.39 upto 3.3.4. Above that not tested.
> Something not consist here.
>
> So which kernel version you guys are using which are seeing this problem ?
>
>
> On Monday, February 23, 2015 3:13 PM, Danny Magat <danny at sb-ps.ae> wrote:
> This problem is still exist on my setup.
> http://lists.coova.org/pipermail/chilli/2013-November/002437.html
>
> I hope that somebody will give us a hint on how to solve this.
>
> Regards,
> Danny
>
> -----Original Message-----
> From: chilli-bounces at coova.org [mailto:chilli-bounces at coova.org] On 
> Behalf Of chilli-request at coova.org
> Sent: Sunday, February 22, 2015 4:00 PM
> To: chilli at coova.org
> Subject: Chilli Digest, Vol 63, Issue 12
>
> Send Chilli mailing list submissions to
>      chilli at coova.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
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> or, via email, send a message with subject or body 'help' to
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>
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> Today's Topics:
>
>     1. Too sharp upload bandwidth limit on 1gbps wired network (kl)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 22 Feb 2015 02:21:53 +0000 (UTC)
> From: kl <kl522 at yahoo.com>
> To: Chilli List <chilli at coova.org>
> Subject: [Chilli] Too sharp upload bandwidth limit on 1gbps wired
>      network
> Message-ID:
>      <122480453.6349415.1424571713923.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
>
>
> Nobody is facing this issue with coova chilli ?
>
> http://www.coova.org/node/5171
>
> https://github.com/coova/coova-chilli/issues/32
>
> Happens only on Gigabit wired network and certain kernel verson. 
> Applies to 1.2.9, 1.3.0 and other versions ....
>
>
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> End of Chilli Digest, Vol 63, Issue 12
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