netdev - RE: rx_dropped packets stop with tcpdump running

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Message-ID: <061C8A8601E8EE4CA8D8FD6990CEA8910FF2D23F@ORSMSX102.amr.corp.intel.com>
Date:	Thu, 19 Apr 2012 17:57:24 +0000
From:	"Dave, Tushar N" <tushar.n.dave@...el.com>
To:	Marco Berizzi <pupilla@...mail.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: RE: rx_dropped packets stop with tcpdump running

Marco,

Do you see any packet drop at HW level?
How are you measuring drop packet? ethtool -S ethx shows you any packet drop?
Also can you please send me the eeprom dump of you card/LOM. ethtool -e ethx


-Tushar

>-----Original Message-----
>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>On Behalf Of Eric Dumazet
>Sent: Thursday, April 19, 2012 6:28 AM
>To: Marco Berizzi
>Cc: netdev@...r.kernel.org
>Subject: Re: rx_dropped packets stop with tcpdump running
>
>On Thu, 2012-04-19 at 15:24 +0200, Eric Dumazet wrote:
>
>> 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.
>>
>>
>
>Its done since 2.6.37 (commit caf586e5)
>
>
>
>
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