Re: [PATCH 1/3] cxl/port: Convert PCIe link latency to nanoseconds

[Alison Schofield]

On Fri, Oct 09, 2026 at 01:54:50PM +0900, Koichiro Den wrote:
> Commit 51293c565cf4 ("cxl: Fix incorrect region perf data calculation")
> converted CDAT latencies to nanoseconds and removed the conversion in
> cxl_region_perf_data_calculate(), but left PCIe link latencies in
> picoseconds.
> 
> This inflates the FlitLatency contribution to region and node latencies
> by a factor of 1000, exposing incorrect values in sysfs. The resulting
> abstract distances can incorrectly reverse the memory tier ordering of
> nodes.
> 
> Convert the FlitLatency contribution to nanoseconds before adding it to
> the access coordinates, rounding up as cdat_normalize() does.

Reviewed-by: Alison Schofield <alison.schofield@xxxxxxxxx>