WP7213 Dave:
Gerrit discovered that the fast computer glitching is possibly related to the location of the OneStop card on the pci bus. All four of the LHO fast computers have the X9SRL motherboard from Supermicro. On this board, the first PCIe slot (slot 1) is connected to the PCH (Platform Controller Hub) while slots 2-7 are directly connected to the CPU. Several of the 2-7 slots share a bus, while slot 5 has its own bus.
I confirmed that the PCIe card layout on h1susey and h1susey were identical (slot order is as seen from the rear of the computer).
| slot id | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| card | empty | empty | empty | VMIC-5565 | Dolphin | OneStop | IRIG-B |
In this layout, the OneStop card (slot 2) shares a bus with slot 3 (Dolphin) and slot 7 (empty).
To test if the ADC/TIM glitch rate could be reduced with a card reconfiguration, on h1susey I have moved the OneStop card from slot-2 to slot-5 so it has its own bus.
Before powering down h1susey Jeff started the SWWD bypass on h1iopseiey. Unfortunately, even though I completed the hardware change in the prescribed 20 minutes, the power cycle of h1susey caused a Dolphin glitch on power up, so this was for nought. All models on h1seiey and h1iscey were subsequently restarted.