Submitted by impire on Fri, 10/28/2011 - 02:28
Hello,
When I back up the virtual server via the browser, it seems the bandwidth only go up to 488 KB/s. I have tested this both via local network and remote location. Same result.
Is Virtualmin restricting/limiting the download bandwidth? If so, how do I lift this limit?
Thanks in advance for your help.
Status:
Closed (fixed)
Comments
Submitted by andreychek on Fri, 10/28/2011 - 10:00 Comment #1
Howdy -- nope! There isn't any form of rate limiting done within Webmin/Virtualmin.
You can see the code for that in "/usr/share/webmin/virtual-server/backup.cgi" beginning on line 151.
Virtualmin creates a temp file containing the backup -- and then begins sending that to the browser as fast as it can.
It's possible that you're just seeing a limitation with files being dynamically sent to a browser, as using tools that do FTP or SCP would be more efficient.
That said -- we can try an experiment.
See line 157 that reads:
while(read(TEMP, $buf, 1024) > 0) {Try changing that "1024" to instead be, say, "4096", or even "8192".
That will cause it to act in bigger chunks, which could potentially offer a speed difference.
If you make that change, restart Webmin afterwards with "/etc/init.d/webmin restart".
Let us know if you see a difference after making that change.
Submitted by impire on Sun, 11/13/2011 - 16:23 Comment #2
Per your recommendation, I am using FTP instead. Thanks for your support.
Submitted by JamieCameron on Sun, 11/13/2011 - 17:43 Comment #3
Cool .. closing this ticket then.
Submitted by Issues on Sun, 11/27/2011 - 17:45 Comment #4
Automatically closed -- issue fixed for 2 weeks with no activity.