# Complete links missing from data with 2nd CRU **URL:** \ **Category:** O² CRU\ **Created:** [November 9, 2018, 1:58pm UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169 "2018-11-09T13:58:29Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![talt](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@talt](https://alice-talk.web.cern.ch/u/talt)\ **Post date:** [November 9, 2018, 1:58pm UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169/1 "2018-11-09T13:58:29Z")
Hello CRU team, we have 2 CRUs in FLP2. Each CRU supports 2 x 9 = 18 links. CRU 0 works well but we see some strange behavior with the second CRU. Both CRUs run identical FW. ```auto =========================================================================================== # Type PCI Addr Vendor ID Device ID Serial FW Version Card ID ------------------------------------------------------------------------------------------- 0 CRU 04:00.0 0x1172 0xe001 0 0-0-4a3df76b 00010002-00000000 1 CRU 05:00.0 0x1172 0xe001 0 0-0-4a3df76b 00010002-00000000 2 CRU 83:00.0 0x1172 0xe001 0 0-0-4a3df76b 00010002-00000000 3 CRU 84:00.0 0x1172 0xe001 0 0-0-4a3df76b 00010002-00000000 =========================================================================================== ``` We use identical scripts to take data, only the PCI-E address got modified accordingly and the readout configuration file. What we see is the following: - data from random links “disappears”, meaning it is not in the data written to file. - sometimes data from a complete EP is missing. - sometimes there is no SYNC at all in the data Cheers, Torsten ---
**Author:** ![talt](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@talt](https://alice-talk.web.cern.ch/u/talt)\ **Post date:** [November 9, 2018, 2:06pm UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169/2 "2018-11-09T14:06:20Z")
To clarify what i mean with data from random links “disappears”. I start the readout and i expect data from Link 0-8 and Link 12-20 (2 x 9). Now, in the first readout i would see data from Link 0,1,2,3,4,5,6,8 and Link 12-20. So data from Link 7 is completely missing, no packages with that ID. Next time i read out, i would see the same but with a different link. So now link 8 is missing but 7 is there. ---
**Author:** ![costaf](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/c/c0e974/32.png) [@costaf](https://alice-talk.web.cern.ch/u/costaf)\ **Post date:** [November 12, 2018, 8:34am UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169/3 "2018-11-12T08:34:15Z")
Ciao, thx for reporting this. I’ll check if I can reproduce the issue in the lab. Keep you posted. Cheers ---
**Author:** ![costaf](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/c/c0e974/32.png) [@costaf](https://alice-talk.web.cern.ch/u/costaf)\ **Post date:** [November 12, 2018, 10:14am UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169/4 "2018-11-12T10:14:58Z")
Ciao Torsten, how big is the file you are recording on the disk? I was doing some tests dumping 50 MB on the disk and using 11 links per End points. This is my config ```auto [bank-a1] type=MemoryMappedFile size=2G numaNode=1 [bank-a2] type=MemoryMappedFile size=2G numaNode=2 [bank-b1] type=MemoryMappedFile size=2G numaNode=1 [bank-b2] type=MemoryMappedFile size=2G numaNode=2 [equipment-rorc-1] equipmentType=rorc enabled=1 cardId=21:00.0 generatorEnabled=0 rdhCheckEnabled=0 rdhDumpEnabled=0 memoryPoolNumberOfPages=1000 memoryPoolPageSize=2M linkMask=0-11 memoryBankName=bank-a1 blockAlign=2M and the second equipment identical to the first ``` Now indeed I missed one link from time to time. But I tried to increase the file to 100 MB and I could see the remaining link. I am using the firmware 2.5.0 … and scanning the file created by readout in this way ```auto python eventDump.py /tmp/data.raw | grep " 0)" | grep " 0x1 0" 0) 0x112233 0x112244 0x2776cec 0x1 0x0 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x1 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x2 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x3 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x4 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x5 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x6 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x7 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x8 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x9 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x0 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x1 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x2 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x3 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x4 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x5 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x6 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x7 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x8 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0x9 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0xa 0x1ee02000 0x12ec 0x1ea04003 0) 0x112233 0x112244 0x2776cec 0x1 0xa 0x1ee02000 0x12ec 0x1ea04003 ``` I can count the link ID on each end point. All the link ID are printed at constant pace (the time for the program to go through the different SUPERPAGE and check the data) … but the last one comes very late. I will check with Sylvain if the allocation of the memory blocks has some strange behavior … but I guess your link is not lost … could you try to increase the size of the file you store on the disk and check if you find the missing link? Thx ---
**Author:** ![talt](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@talt](https://alice-talk.web.cern.ch/u/talt)\ **Post date:** [November 12, 2018, 7:39pm UTC](https://alice-talk.web.cern.ch/t/complete-links-missing-from-data-with-2nd-cru/169/5 "2018-11-12T19:39:52Z")
Hi Pippo, i will try to test it tomorrow, we were busy with other stuff today. The general issue with the file size defined in the file recorder i was aware of, we ran into the problem before when i forgot to adapt it for more links. At the moment we run with 20 links and the SP for each link is set to 1M. So we set the file size in the file recorder to twice the total size, 40M. But the missing data is still there. Will increase it further tomorrow. Cheers, Torsten