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Aholics.com
Joined: 17 Mar 2006
Posts: 23
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 Posted: Mon Mar 20, 2006 12:40 am Post subject: Limit Bandwidth Doesn't Work? |
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Why is it that the limit bandwidth option doesn't seem to be doing much of anything? Please see the image below. Painfully obvious that it's not keeping traffic within bounds, and I can confirm this using bandwidth monitors on various remote servers these files are being pulled from.
Is this calculation being done over time, or on a per-file basis, or some other method? Either way, it seems to be it needs some adjustments.
Thanks for any insight. |
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TGRMN Software
Site Admin
Joined: 10 Jan 2005
Posts: 8759
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| Posted: Mon Mar 20, 2006 3:59 am Post subject: |
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Bandwidth is calculated every X seconds .... BUT: sometimes the Windows cache gets in the middle 
Are you copying files from/to network? Are you on Win Server 2003?
Anyway, try flush the option flush buffer every write (also in the performance/bandwidth tab) which works around the Windows cache.
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Aholics.com
Joined: 17 Mar 2006
Posts: 23
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| Posted: Sun Mar 26, 2006 6:27 am Post subject: |
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| TGRMN Software wrote: | Bandwidth is calculated every X seconds .... BUT: sometimes the Windows cache gets in the middle
Are you copying files from/to network? Are you on Win Server 2003?
Anyway, try flush the option flush buffer every write (also in the performance/bandwidth tab) which works around the Windows cache. |
Hi, finally got around to doing some testing with this. Yes, it's over the Internet using a UNC path through a VPN tunnel. I am on a Win2k server, the remote server is Win2k3. I tried the "flush buffer every write" option and this is the bandwidth graph I got:
The left side of the graph is multiple small files. The long flat stretch is a few very large files. The large files seem to hit the mark just right. However, when there are smaller files you can see the system spiking (and maintaining) well over my 40k limit I had set. I'm sure they would have gone higher if my firewall didn't throttle them at the peaks.
Please note that this graph is over a 10 hour timespan!
You can see a little more detail on the spiking sections in the graph below:
Thanks for any thoughts... |
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TGRMN Software
Site Admin
Joined: 10 Jan 2005
Posts: 8759
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| Posted: Sun Mar 26, 2006 8:16 am Post subject: |
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If the average small file size in the example (for which bandwitdh limit does not work) is smaller than the ViceVersa buffer size (in the profile settings -> performance/execution), that could be the source of the problem... in that case try a very small buffer e.g. 1024 bytes.
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TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com |
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Aholics.com
Joined: 17 Mar 2006
Posts: 23
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| Posted: Mon Mar 27, 2006 5:42 am Post subject: |
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| After a quick test, this seems to do the trick... I'll let ya know how the next big backup goes. Thanks again for the great support, and great product. |
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Aholics.com
Joined: 17 Mar 2006
Posts: 23
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| Posted: Sun Apr 02, 2006 6:23 am Post subject: |
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FYI, the system was much better at keeping the BW down after modifying the buffer size.
Thanks (again) for a great product! |
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