From: Alessandro Vesely <vesely@tana.it>
To: netfilter@vger.kernel.org
Subject: Re: libnetfilter_queue question
Date: Thu, 05 May 2011 11:12:42 +0200 [thread overview]
Message-ID: <4DC26A0A.8050402@tana.it> (raw)
In-Reply-To: <1304533951.25221.8.camel@hakkenden>
On 04.05.2011 20:32, Nikolay S. wrote:
> В Срд, 04/05/2011 в 20:13 +0200, Alessandro Vesely пишет:
>> On 04.05.2011 08:14, nowhere wrote:
>>> Several packets at the beginning get lost.
>>
>> Are they always at the beginning, or does that depend on the distribution of
>> delays?
>
> Indeed. The first packet is never dropped, then comes a serie of drops
> (the number of dropped packets depends on the sending rate, i.e. testing
> with iperf on, say, 50 Mbit/s shows drops of ~800 packets) and after
> that no drops at all. Distribution and it's parameters do not matter
> except for zeroes: if there is no artificial delay, no packets are
> dropped.
Looks like pretty reproducible. I'll have a try with your code when I get
back to my place.
>> I see nothing wrong in it. However, I'd print out occurrences of rv < 0
>> after recv() and look for errno==ENOBUFS in particular. It should report
>> lost packets
>
> Yes, I did it (actually this was one of the first checks). There are no
> situations when rv < 0.
Did you check return codes from nfq_set_verdict()? If that is 0, it must be
a bug. What versions of library and kernel are you using?
next prev parent reply other threads:[~2011-05-05 9:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-04 6:14 libnetfilter_queue question nowhere
2011-05-04 18:13 ` Alessandro Vesely
2011-05-04 18:32 ` Nikolay S.
2011-05-05 9:12 ` Alessandro Vesely [this message]
2011-05-05 9:24 ` nowhere
2011-05-11 17:27 ` NFQUEUE looses packets between arrival and verdict Alessandro Vesely
2011-05-11 22:56 ` Ed W
2011-05-12 9:40 ` nowhere
2011-05-12 18:03 ` NFQUEUE the plot is growing Alessandro Vesely
2011-05-13 18:25 ` Nikolay S.
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