I remember the 3c590 (https://github.com/torvalds/linux/blob/20cb38a7af88dc40095da7c2c9094da3873fea23/drivers/net/ethernet/3com/3c59x.c#L1187 https://github.com

I remember the 3c590 (https://github.com/torvalds/linux/blob/20cb38a7af88dc40095da7c2c9094da3873fea23/drivers/net/ethernet/3com/3c59x.c#L1187 https://github.com/torvalds/linux/blob/20cb38a7af88dc40095da...) doing something awful too which required changing the PCI latency setting from 32 to 248 to avoid some catastrophic errors. It's amazing how much stuff is hidden from view by drivers and firmware updates.