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From: Edgar Toernig <froese@gmx.de>
To: Michael Clark <michael@metaparadigm.com>
Cc: Manfred Bartz <md-linux-kernel@logi.cc>,
	linux-kernel@vger.kernel.org, linux-net@vger.kernel.org
Subject: Re: Real Time Traffic Flow Measurement - anybody working on it?
Date: Thu, 19 Apr 2001 23:35:22 +0200	[thread overview]
Message-ID: <3ADF5A1A.CE914410@gmx.de> (raw)
In-Reply-To: <HBEEKENFCJOPCENEDAGHOEAECCAA.michael@metaparadigm.com>

Hi,

Michael Clark wrote:
> 
> An obvious kernel improvement for userspace meters like NeTraMet would
> be to give libpcap's pcap_read a kernel interface that can return more
> than one packet at a time (the libpcap interface has this capability).

It's already there - the turbo packet interface (PACKET_RX_RING sockopt).
Very nice and fast.  Direct transfer to mmapped memory.

> An additional feature for network devices that could support it (not
> sure if this is feasible) would be to switch to an 'interrupt when
> packet buffer full' when in promiscuous mode.

With the RX_RING you can poll a memory location in the mmapped memory
to detect whether there are new packets.  You basically only perform
a system call (poll/select) if there's nothing more to do.

Ciao, ET.


  reply	other threads:[~2001-04-20  0:16 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-04-19  4:15 Real Time Traffic Flow Measurement - anybody working on it? Manfred Bartz
2001-04-19 14:45 ` Michael Clark
2001-04-19 21:35   ` Edgar Toernig [this message]
2001-04-20 16:58 ` Harald Welte

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