We have SAS programmers and they reported that sometimes when they open their SAS files (SAS7BDAT), they get timeout error. Is there any thing I can check or tweak in our CIFS configuration to find out if there is something that wrong that needs fixing?
You can also search for cifs neg_buf_size tuning in addition to the window size in the above tr and consider also opening a performance case (most the options require a restart of cifs after changing). It could be other latency issues separate from cifs that a perfstat could show.
The timeout error might be because of the value set to the "cifs.idle_timeout" option which is in generally mentioned in seconds. This time in seconds terminates an idle session (no files open). Let me know if this works out or not.