Hi,Jack
I realized a firmware that acquire data using ADC_MKID_4X yellow block and
then pack the data into multi 64bits data to 10Gb yellow block in ROACH2.The PC
receiver UDP package through 10Gb cable.The ADC_MKID_4x board clock is
512MHz,and the ROACH2 worked on 128MHz. I use part of Tutorial 2 's design to
control the tx_valid port and tx_end_of_frame port of the 10Gb yellow block .I
set the tx_valid is 1081 and the tx_end_of_frame was set to 1441. The UDP
package is 8648 bytes less than the max capacity (8k+512) of 10Gb yellow block
. Now,the firmware worked well. I can get about 1500 UDP frames without losing
data in the PC server once a time. Because every UDP frame has frame counter,so
I can judge that the frames is continuous or not.The firmware was running
continuously,and I can get right data from PC during different time. The frame
counter is continuous. But when I want to receive much more packages,such as
100000 packages once a time, I found that the fram counter is not continuous,
part of the frame was lost.The valid data (ADC data)rate is 6.144Gb/s.
(512*10^6*12bit/s)
I suspect the reason of losting UDP frams coming from two sources. Frist,
the PC server's receive program(C++) need to optimize to realize high
frequency and large capacity udp data receiving . Another reason may be coming
from the network setting of the linux system in PowerPC on ROACH2, I am not
sure.
My question is how to check and modidy the network setting of the linux
system in ROACH2？ I want to check the max send buffer (MTU )of the PowerPC.
Thank you!
Cheers!
>------------------------------------------------------------------------
ZHANG Laiyu
Phone(China) 010-88233078
Cellphone(China) 13681385567
E-mail: [email protected]
Address: 19B Yuquan Road,Shijingshan District,Beijing，China
Department: Center for Particle Astrophysics
Office: Astrophysics Building 205
Institute of High Energy Physics, CAS
web: http://www.ihep.cas.cn
>------------------------------------------------------------------------
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