Hi,Dave, Thanks for your reply.Our switch ports are enough,but the Nics on
roach is not enough(we only have 4 ports each roach),so if we send packets to x
box though switch,we only need 4 10Gbe ports on each roach.that is why we want
to use the pre-build paper model. if we want to use the pre-build model,the
initial ruby scripts may should be modified.the eth_n_gpu codes should be
delete,the arp codes of eth_n_sw should be changed.except the ethernet part of
ruby codes should be modified,need the other parts codes like the PFB ,EQ parts
be changed?could the pre-build model and scripts find on the websites? Best
Regards! Peter -- 发自 Android 网易邮箱 On 2014-12-03 01:01 , David MacMahon Wrote:
Hi, Peter, If you have enough ports on the switch then you certainly can
configure things to send the packets directly from the ROACHs to the various X
boxes. The pre-built PAPER model will support this if properly configured.
The one thing to keep in mind is the IP-to-MAC address table in the 10 GbE
cores. These are setup by paper_feng_init.rb. You could use the "factory" MAC
addresses of the X-box 10 GbE interfaces or you could configure the X boxes to
set their 10 GbE MAC addresses to predefined values. If using the latter
approach, we often use 02:02:ww:xx:yy:zz where ww:xx:yy:zz corresponds to the
IP address. Hope this helps, Dave On Dec 1, 2014, at 5:21 AM, Peter Niu wrote:
> Hi,Dave, > Thanks for your Document about EQ,and suggestion about the sample
rate.Now I have a question about the correlator architecture. > I have saw your
PPT : > Correlator Architectures > Present and Future > CASPER Workshop 2011 >
> The structure mentioned in the PPT is the structure PAPER used now .Using a
set of precise IP assignment to avoid Loop Back is ok. However,If we use the
Packetized F/X Concept:Uses two ports on switch per F/X pair.It may not meet
the Loop Back problem.On the switch, The IP address will tell the packet which
Xeng to go .The structure which The PAPER model using now is the eth_?_gpu port
on ROACH connect HPC port directly.Is this only for saving ports on
switch?Well,Our switch have 64 ports,If we use the two ports on switch per F/X
pair Concept,the ports may be sufficient . > This is the question asked by my
teacher Wu fengquan. As PAPER provide a lot of ruby control scripts online to
use,I'd rather use this model exits now.What should I say to him?Is there some
more advantages to use this structure instead the two ports on switch per F/X
pair? > Thanks for your help! > Best wishes! > Peter > > > >
