From: Andi Kleen <ak@muc.de>
To: subba9@home.com (Subba Rao)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Half Duplex and Zero Copy IP
Date: 10 Aug 2001 20:46:31 +0200 [thread overview]
Message-ID: <k266bveos8.fsf@zero.aec.at> (raw)
In-Reply-To: <20010810095313.A6219@home.com>
In-Reply-To: subba9@home.com's message of "Fri, 10 Aug 2001 13:53:56 +0000 (UTC)"
In article <20010810095313.A6219@home.com>,
subba9@home.com (Subba Rao) writes:
> Hello,
> I have 2 3Com NICs on my system. They are 3c905C Tornado PCI cards.
> The drivers are compiled into the kernel (Slackware 8.0 with kernel 2.4.7).
> One of the interfaces will be used as a sniffer interface (without IP address)
> and a very high traffic pipes. I do not wish to loose any packets coming to this
> interface. Is it better if I initialize the interface in HALF DUPLEX mode? If yes,
> how do I set the card to HALF DUPLEX mode? How can I find out the HW (NIC) settings
> on the system?
Half duplex mode will only make your line slower, it has no benefit.
> Another question about 3Com NICs, do they perform zero-copy IP? I read that
> the performance improves a lot WITHOUT zero-copy IP.
The sniffer zero copy implementation as implemented in some libpcaps
does not depend on any special NIC support; it should work with any.
-Andi
next prev parent reply other threads:[~2001-08-10 18:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-10 9:53 Half Duplex and Zero Copy IP Subba Rao
2001-08-10 18:36 ` Andrew Morton
2001-08-11 7:59 ` Subba Rao
2001-08-10 18:46 ` Andi Kleen [this message]
2001-08-10 23:50 ` Jamie Lokier
2001-08-11 0:00 ` Andi Kleen
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