From: Eric Dumazet <eric.dumazet@gmail.com>
To: Marco Berizzi <pupilla@hotmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: rx_dropped packets stop with tcpdump running
Date: Thu, 19 Apr 2012 15:24:25 +0200 [thread overview]
Message-ID: <1334841865.2395.177.camel@edumazet-glaptop> (raw)
In-Reply-To: <DUB108-W3E0658169335663BE7574B23D0@phx.gbl>
On Thu, 2012-04-19 at 15:12 +0200, Marco Berizzi wrote:
> Hi Folks,
>
> I'm running linux 3.3.2 on slackware64
> 13.1 as a firewall and ipsec gateway.
> I'm experimenting a problem on one of
> the nics: I see the rx_dropped packets
> counter increasing. Running tcpdump on
> that nic (eth2) 'fix' the problem: the
> counter doesn't increase anymore.
> The only remarkable running daemon is
> openswan 2.4.15
>
> Same problem happens with linux 2.6.37
>
> The connection is at 1000Mbit/s copper,
> full duplex.
>
> Any feedback are welcome
> TIA
When linux receives a packet with no protocol handler, we increment the
rx_dropped counter.
When you start a tcpdump, all packets are handled, so we dont increment
rx_dropped for this reason anymore.
next prev parent reply other threads:[~2012-04-19 13:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 13:12 rx_dropped packets stop with tcpdump running Marco Berizzi
2012-04-19 13:24 ` Eric Dumazet [this message]
2012-04-19 13:28 ` Eric Dumazet
2012-04-19 17:57 ` Dave, Tushar N
2012-04-20 8:34 ` Marco Berizzi
2012-04-20 14:59 ` Brian Haley
2012-04-20 15:25 ` Marco Berizzi
2012-04-22 5:13 ` Bill Fink
2012-04-25 18:19 ` Dave, Tushar N
2012-05-03 11:08 ` Marco Berizzi
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