On 27.07.2013 02:14, Barney Cordoba wrote:
------------------------------------------------------------------------
*From:* Daniel Feenberg <feenb...@nber.org>
*To:* Alexander V. Chernikov <melif...@freebsd.org>
*Cc:* Barney Cordoba <barney_cord...@yahoo.com>;
"freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
*Sent:* Friday, July 26, 2013 4:59 PM
*Subject:* Re: Recommendations for 10gbps NIC
On Fri, 26 Jul 2013, Alexander V. Chernikov wrote:
> On 26.07.2013 19:30, Barney Cordoba wrote:
>>
>>
>> ------------------------------------------------------------------------
>> *From:* Alexander V. Chernikov <melif...@freebsd.org
<mailto:melif...@freebsd.org>>
>> *To:* Boris Kochergin <sp...@acm.poly.edu <mailto:sp...@acm.poly.edu>>
>> *Cc:* freebsd-net@freebsd.org <mailto:freebsd-net@freebsd.org>
>> *Sent:* Thursday, July 25, 2013 2:10 PM
>> *Subject:* Re: Recommendations for 10gbps NIC
>>
>> On 25.07.2013 00:26, Boris Kochergin wrote:
>> > Hi.
>> Hello.
>> >
>> > I am looking for recommendations for a 10gbps NIC from someone who has
>> > successfully used it on FreeBSD. It will be used on FreeBSD
9.1-R/amd64
>> > to capture packets. Some desired features are:
>> >
We have experience with HP NC523SFP and Chelsio N320E. The key difference
among 10GBE cards for us is how they treat foreign DACs. The HP would PXE
boot with several brands and generic DACs, but the Chelsio required a
Chelsio brand DAC to PXE boot. There was firmware on the NIC to check the
brand of cable. Both worked fine once booted. The Chelsio cables were hard
to find, which became a problem. Also, when used with diskless Unix
clients the Chelsio cards seemed to hang from time to time. Otherwise
packet loss was one in a million for both cards, even with 7 meter cables.
We liked the fact that the Chelsio cards were single-port and cheaper. I
don't really understand why nearly all 10GBE cards are dual-port. Surely
there is a market for NICs between 1 gigabit and 20 gigabit.
The NIC heatsinks are too hot to touch during use unless specially cooled.
Daniel Feenberg
NBER
---------------------
The same reason that they don't make single core cpus anymore. It costs
about the
same to make a 1 port chip as a 2 port chip.
I find it interesting how so many talk about "the cards", when most
often the
differences are with "the drivers". Luigi made the most useful comment;
if you ever
want to use netmap, you need to buy a card compatible with netmap. Although
you don't need netmap just to capture 10Gb/s. Forwarding, Maybe.
I also find it interesting that nobody seems to have a handle on the
performance
differences. Obviously they're all different. Maybe substantially different.
It depends on what kind of performance you are talking about.
All NICs are capable of doing linerate RX/TX for both small/big packets.
The only notable exception I;m aware of are Intel 82598-based NICs which
advertise PCI-E X8 gen2 with _2.5GT_ link speed, giving you maximum
~14Gbit/s bw for 2 ports instead of 20.
The x540 with RJ45 has the obvious advantage of being compatible with
regular gigabit cards,
and single port adapters are about $325 in the US.
When cheap(er) 10g RJ45 switches become available, it will start to be
used more and more.
Very soon.
BC
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