Dear All,
Here's an update on what we are doing at the GMRT, for CX4 to SFP+
conversion adaptor :
The adapter module will need a PHY chip to convert the four lane 3.125
Gbps CX4 to a single 10Gbps SFP+ output. Currently, we have selected the
Vitesse Quad PHY chip VSC 8484 for the same. The
Can one use the zarlink (or something like it) on the ROACH end, and
connect the fiber to an SFP+ module in the computer or switch? It seems
like someone ought to make such a beast, considering there are a lot of
cx-4 ports in the field that need to be connected to new CX-4 - only
switches and
Can one use the zarlink (or something like it) on the ROACH end, and
connect the fiber to an SFP+ module in the computer or switch? It seems
like someone ought to make such a beast, considering there are a lot of
cx-4 ports in the field that need to be connected to new CX-4 - only
Er, make
I'm talking with the engineers at Chelsio about just such a beast and expect
a call back on Monday. I imagine I'll go with CX4 on both ends and Zarlink
for now, but it seems like something the ROACH community needs to think
about - sound like GMRT is doing something like this.
Every time I've
I'm talking with the engineers at Chelsio about just such a beast and
expect
a call back on Monday. I imagine I'll go with CX4 on both ends and Zarlink
for now, but it seems like something the ROACH community needs to think
about - sound like GMRT is doing something like this.
Every time
I just turned 30 and still saw a fair amount of 10BASE2 (with BNCs) when I
was working at the computer help desk in college. It's not that old.
Yes, it's extremely puzzling that there isn't an off-the-shelf solution for
this that everyone knows about.
Tom
On Sat, Jan 29, 2011 at 10:17 AM, John
hi tom,
appended below is a list of11 alternate models of CX4 10Gbe NIC boards.
(other than chelsio and myricom).
this is a very old list, from august 2008,
and there other several newer cards from many
other companies, but i don't have an up to date list.
(sorry). i also don't know which
hi tom,
i suggest you purchase a myricom 10Gbe CX4 NIC board,
rather than a chelsio board. the myricom boards work
well and jason wrote a casper memo with test results on myricom nics.
myricom has drivers optimized for UDP packets,
and drivers that skip over kernel memory and transfer data
hi tom,
one more note:
if you use fiber optic CX4 cables,
please see the warning at
http://casper.berkeley.edu/wiki/Recommended_10_GbE_Hardware
not all NIC boards have built in power to support
fiber optic cables. check with myricom.
the ibob/bee2/roach boards have built in power.
dan
The Myricom people told me they don't make NICs with active ports- ie,
aux power for the fiber translator. That's why we bought the Chelsio.
Anton is getting 6Gb/s throughput with the Chelsio- we haven't tried to
push it further. I wasn't aware of the UDP packet handling stuff, though.
I am avoiding Myricom for the reasons Rick mentioned. It took a long time
for me to get the sales/technical person to even understand that I wanted to
go from CX4 to fiber.
But Chelsio, as several have mentioned on this list, provides the power
necessary for transceivers to work. They also have
And don't forget that the switches that are XFP and SFP+ sometimes
(usually?) don't include the optics for each port in the switch price.
With CX4, all you need is a cable, if you're within a few meters.
Yes - that list is years old.
Those Fujitsu and HP switches have been tested with the
Yes - when pricing switches, or any sort of (sub-)system, a full
BOM must be used to make a meaningful comparison.
Matt
On Mon, 9 Aug 2010, John Ford wrote:
And don't forget that the switches that are XFP and SFP+ sometimes
(usually?) don't include the optics for each port in the switch
Casper-folks:
Hoping to short-circuit a fair amount of research here in the hope
that someone has had to do this already. I'll soon be looking to
connect 10-20 ROACH boards by 10 gbe to a data acquisition
computer(s).
It seems like the smartest way of doing that is getting a 16-port
switch or
No.
Believe it or not I spent a long time looking everywhere but the
Casper wiki. Should have thought of that because that's where we got
the Myricom card from.
Those listed are at the higher end of the price range I've seen. Looks
like ~$10k is the amount I should be prepared to spend.
Am I
No.
Believe it or not I spent a long time looking everywhere but the
Casper wiki. Should have thought of that because that's where we got
the Myricom card from.
Those listed are at the higher end of the price range I've seen. Looks
like ~$10k is the amount I should be prepared to spend.
Matt, John:
I would just as soon use 10-100Mbit, but the firmware we have
developed uses the 10 gbe port. I understand this to be fairly
fundamental in that the CASPER libraries allow simpler interfacing of
the memory to the 10 gbe than to the 100 Mbit. My recollection of the
details is fuzzy
On Thu, Aug 5, 2010 at 3:21 PM, Matt Dexter mdex...@berkeley.edu wrote:
Hi Tom,
were you aware of these ?
http://casper.berkeley.edu/wiki/Recommended_10_GbE_Hardware
Sadly the list is out of date: some of the switches are no longer in
production. The XG700, for example, is great and cheap
Tom Downes wrote:
I would just as soon use 10-100Mbit, but the firmware we have
developed uses the 10 gbe port. I understand this to be fairly
fundamental in that the CASPER libraries allow simpler interfacing
of the memory to the 10 gbe than to the 100 Mbit.
That's correct. The problem is
The XG700 does look pretty good at its pricepoint. We could get away
with 12 ports for a while I think. Heck, we might be able to buy 2 if
we can find them.
Thanks all for help. I would appreciate any experience people have
with transceivers too.
Tom
On Thu, Aug 5, 2010 at 4:11 PM, Andrew
we mainly use Zarlink for casper-casper and casper-Fujitsu switch links
Not NICs. I think the only NIC application is Fujitsu switch to
1U server w/ Chelsio N310E-CX card (via copper and active
Zarlink and Fujitsu fiboer optic links).
The issue w/ NICs and some other CX4 devices is that they
Yes - that list is years old.
Those Fujitsu and HP switches have been tested with the CASPER hardware
and found to work as advertised.
There are lots of new products available. More announced
all the time. We are in contact with a number of vendors in
hopes of getting demo units to try in
hi tom,
if you don't need much more than 10 Mbit/sec, then your system will
be a lot cheaper if you use the 1Gbit roach ports. you'll have to change
your gateware and software a bit to do this, but you'll save a lot of money
in 10Gbe switches, cables, and nic boards.
if you want to stick
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