Research "Good" default timeouts

[mraineri]

Recent additions start specifying timeouts to apply either on a specific request or in general at the script entry point.

• rf_logs.py specifies a timeout of 30 when instantiating the Redfish object
• All other scripts specify a timeout of 15 when instantiating the Redfish object
• Multipart push update applies 2 seconds per MB (determined from the file size)

Original times were a bit more strict (5 seconds for all scripts, and approximately 1 second for every 3 MB for a push update).

15 seconds could be a bit aggressive for most usage and we could likely bring this back down to 5 seconds. However, the log entry reading could easily go past this in some cases, so maybe we could push the 30 seconds down to the log entry retrieval itself.

I don't have a good sense of a "right" answer for the multipart update one; file sizes can be large, and should we penalize fast networks for being accommodating of slower networks? Is there a better solution? In Ansible, a user has to specify the timeout, but I prefer to avoid adding more options.

[IamSarki]

While testing a device update using rf_update.py on a small IoT device, I noticed that for large files (over 50MB), the multipart request times out after only 70% of the file is uploaded. To resolve this, I had to manually adjust the timeout in the script. Could a timeout argument be added, or perhaps the timeout logic adjusted based on the total file size?

[mraineri]

Sure, that's certainly something we can add as an option.

Out of curiosity so I can better understand the scale, about how fast is the transfer to this device? We do try to make a "best guess" calculation specifically for the update script based on the file size (I think a 50MB file should have a timeout of 100 seconds).

[IamSarki]

Out of curiosity so I can better understand the scale, about how fast is the transfer to this device? We do try to make a "best guess" calculation specifically for the update script based on the file size (I think a 50MB file should have a timeout of 100 seconds).

I ran some tests with dummy files, and here are the results:

• 10MB: 27 seconds
• 20MB: 54 seconds
• 30MB: 77 seconds
• 40MB: 103 seconds