#4734 closed Bug report (wontfix)
High CPU usage while downloading using explicit TLS
| Reported by: | PhiWi | Owned by: | |
|---|---|---|---|
| Priority: | high | Component: | FileZilla Client |
| Keywords: | CPU, Mac, TLS | Cc: | p.winkler@… |
| Component version: | Operating system type: | OS X | |
| Operating system version: | 10.5.8 |
Description
On my 2.8GHz Core 2 Duo iMac I get around 70% CPU usage while downloading files with filezilla from a host using explicit TLS. I am not downloading at very high speed, its a home line (3MB/s max.)
When I am just browing on the server there is no significant CPU usage.
Probably some issue regarding OpenSSL?
Thanks!
Attachments (2)
Change History (6)
by , 15 years ago
| Attachment: | Bild 16.png added |
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comment:1 by , 15 years ago
| Status: | new → moreinfo |
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comment:2 by , 15 years ago
| Cc: | added |
|---|---|
| Status: | moreinfo → new |
cipher is AES-256-CBC
when downloading using FizeZilla for Windows the CPU load is low / moderate.
I tested using Windows 7 on a 2.4GHz Core 2 Duo notebook.
(see screenshot_windows.png)
by , 15 years ago
| Attachment: | screenshot_windows.png added |
|---|
comment:3 by , 15 years ago
| Resolution: | → wontfix |
|---|---|
| Status: | new → closed |
I did some profiling, there is nothing I can do to decrease CPU usage. Most of the CPU usage is spent inside libgcrypt over which I have no influence.
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FileZilla uses GnuTLS, not OpenSSL.
Increased CPU usage during TLS encrypted transfers is to be expected compared to plain regular FTP. The encryption can add quite some overhead.
What is the cipher you are using? It gets displayed if you click the certificate icon in the statusbar.