From: Patrick McHardy <kaber@trash.net>
To: bert hubert <bert.hubert@netherlabs.nl>
Cc: cpw@lanl.gov, netdev@vger.kernel.org
Subject: Re: 2.6.18-rc6 memory mapped pcap truncates outgoing TCP packets, but not icmp
Date: Wed, 13 Sep 2006 20:44:21 +0200 [thread overview]
Message-ID: <45085185.2060904@trash.net> (raw)
In-Reply-To: <20060913112307.GA1374@outpost.ds9a.nl>
bert hubert wrote:
> Hi people,
>
> I like to use memory mapped pcap (PACKET_MMAP) since off the shelf, linux is
> a tad prone to drop packets while capturing these days. It used to be lots
> better at it, but right now memory mapped pcap is the only way to get things
> working a bit. I've noticed this on many machines.
>
> However, memory mapped pcap has started to truncate outgoing packets for me
> recently, and interestingly, I only see this with locally generated TCP
> packets, not with locally generated ICMP packets. I haven't yet tried UDP,
> nor actual sniffing, this is all locally generated packets going out on
> eth0.
Are you using TSO on the outgoing device? If so please try to log the
packet using iptables to see if it really is a TSO packet.
next prev parent reply other threads:[~2006-09-13 18:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-13 11:23 2.6.18-rc6 memory mapped pcap truncates outgoing TCP packets, but not icmp bert hubert
2006-09-13 18:44 ` Patrick McHardy [this message]
2006-09-14 8:56 ` bert hubert
2006-09-14 10:02 ` Patrick McHardy
2006-09-14 10:52 ` Alexey Kuznetsov
2006-09-15 12:02 ` bert hubert
2006-09-15 20:16 ` Patrick McHardy
2006-09-18 7:00 ` David Miller
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