FM / parameters

/sys/module/thunderbolt/parameters

Name	Size	Mode	Actions
asym_threshold	4096	0444	edit dl rm
bw_alloc_mode	4096	0444	edit dl rm
clx	4096	0444	edit dl rm
dma_credits	4096	0444	edit dl rm
dprx_timeout	4096	0444	edit dl rm
host_reset	4096	0444	edit dl rm
start_icm	4096	0444	edit dl rm
xdomain	4096	0444	edit dl rm

Edit: /sys/module/thunderbolt/parameters/dma_credits (4096B)