Re: WinScp SFTP upload is deadly slow
Do you want me to send you the logs from this version too?
Yes please (Debug 1 level)
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
Do you want me to send you the logs from this version too?
I have sent you an email with a development version of WinSCP to address you have used to register on this forum. Please test it and let me know if it performs differently.
Indeed the psftp uses the same MAC. So I do not see any other possibility than a local CPU issue. Are you sure that one of the cores is not maxed during the transfer with WinSCP?
Since 5.2.5 WinSCP supports HMAC-SHA-256. It is computationally more demanding than older HMAC-SHA1.
As you claim not to see a high CPU usage on a client side, it might be due to an inefficient implementation on the server-side.
But that would not explain why you do not see any problem with psftp 0.64, which should use HMAC-SHA-256 too. Can you post also its log file?
You do not see the problem with Solarwind server as it does not support HMAC-SHA-256, so WinSCP needs to fallback to HMAC-SHA1.
Thanks for your report.
Can you update the "5.2.5-coreftp" log to include also the header?
Your superuser.com post:
https://superuser.com/q/924268/213663