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Slow loading of directory content via SFTP when timeout is set #3506
Directory listing is wery slow when connecting to a SFTP server with CURLOPT_TIMEOUT or -m cmd option. Without a timeout everything works fast.
Tested on my Mac (macos 10.14.2) when connecting to other Mac with curl v7.64.0 (or with daily snapshot 20190129) with following command:
There is some delay for loading of each subdirectory/file.
After some investigation I found that the bug was introduced with changes to lib/ssh.c in commit 1a89099
Noticed the very same problem and for me it works very slow even without any additional arguments just:
In version 7.61.0 that command takes (for a folder with 4 entries) 0.7s and in 7.61.1 (first affected version) it takes 6.7s for a localhost sftp server.
Same for me, 7.61.1 is way slower than version 7.61.0 when doing a simple sftp listing.
It seems curl-7.61.1 does exactly one line of print-out per second as one can see with --trace-time:
So there is somewhere an artificial 1 second delay per printed line! Hope this rings some bells...