On 2018-05-17 17:05, Rajat Jain wrote:
Hello, I have been thinking about adding counters for different kinds of AERs and expose them via sysfs. IMHO this would help by giving some sense of "link quality" for PCIe links (a lot of correctable AERs may indicate system is workable, but may indicate some signal integrity issues etc). Currently, on a correctable AER, we do log them, but having them in sysfs would allow userspace tools to possibly (periodically) poll them and raise an appropriate warning in case of too many errors. I know that for my purposes, getting some idea of PCI link quality or a way to quantize it, would help. Do you think such counters make sense or would be helpful generically? Also, please let me know if something like this already exists?
This question came from FB folks last year. They were told to use the perf events for counting.
I don't honestly have a strong opinion.
Thanks, Rajat
