YamaT-san, Nakagaki-san, Ikeda

Summary
There have been several reports of IPC glitches.
As a possible solution to this problem, we are going to increase the number of network cards to improve data transfer and see if the glitch can be resolved.

As a method, we are using a Myricom network card to input the daq data for k1dc0.
Currently, one card is installed.
Verify if it improves when the number of cards is increased to two.

Procedure
1. create a k1dc0 with two Myricom cards installed on a new PC and install it in the rack (C1:25,26) .
2. connected with a new cable independent of the original k1dc0.
However, only one port of the optical terminal of the network switch on the In side of the DAQ is empty.
Therefore, it was not possible to make all the cables completely independent.
We unplugged the original optical cable for the In side of k1dc0 and connected a new k1dc0 cable.
3. We copied the original k1dc0 HDD and started it up on the new k1dc0.
4. On the new PC, I changed the IntelNIC setting in /etc/coonf.d/local.start to eth3->eth4.
　I also added a line to set rx-usec of myri1 to 1.
5. After reboot, restart mx_stream and check if daq works correctly.

Result
mx_stream remained at 0xbad and could not communicate properly.
We checked and found that the first Myricom card was connected to the network, but the LED on the other card did not come on and it was in a Link down state.
We tried unplugging and plugging cables, but there was no improvement.

Since there was no time to do the restoration work, I decided to finish the work this time.
I restored the connection to the original k1dc0 and restored it.