Hi, Homin, The first thing to do is figure out where packet loss is actually happening. The fact that you have to reset the 10G yellow blocks to get things going again suggests that the X engines are not keeping up with the data rate (since the F engines will happily churn out 8.96 Gbps data regardless of the receivers' states and the X engines will happily churn out data regardless of the PC's state, it seems that the only way for the 10 GbE blocks to get confused is if the X engines are not keep up with the incoming data rate). I assume the F engine ROACH2s are being clocked via their ADCs. How are the X engine ROACH2s being clocked?
Assuming the F-to-X packets are going through a switch, you could query the switch to see what it thinks the incoming and outgoing data rates are on the various ports involved. Does your design have any way of capturing the overflow flags of the 10 GbE cores? Dave > On Mar 12, 2018, at 19:39, Homin Jiang <[email protected]> wrote: > > Dear Casperite: > > We have been deployed a 7(actually 8) antenna packetized correlator on Mauna > Loa Hawaii. Running at 2.24GHz clock, that means 8.96 G bits per second for > each 10G ethernet. The packet size is 2K. There are 8 sets of ROACH2 as F > engines, the other 8 sets of ROACH2 as X engines. Data packets from F to X > looks fine, the problem of lost packets is the integration data from X engine > to the computer. The 10G yellow blocks in X engines handle the incoming data > packets from F engine at the data rate of 8.96 Gbps, and output the > integration data to PC, the outgoing data rate depends on the integration > time, usually it is longer than 0.5 second. The syndrome is that packets lost > happened by specific X engines after 10,20 minutes or couple of hours. Once > it happened, we reset all the 10G yellow blocks in F and X, then the system > revived. > > I have no idea about the 10G ethernet yellow block. Any comments of > suggestions are highly welcome. > > best > homin jiang > > > -- > You received this message because you are subscribed to the Google Groups > "[email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
