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How can I determine what is the bottleneck in my throughput?

We've been using WinRoute for users, but previously only had a T-1 connection so it was the major limiting factor. After upgrading to a faster connection, it appears WinRoute is now the major bottleneck. Speeds as measured to a ISP speed test page (to minimize the number of hops invovled):

  • Behind modem: 50mbps down / 5mbps up
  • Behind WinRoute: 20mbps down / 3mbps up

I've already tried the things in knowledge base article 395 ( http:// cle&kbarticleid=395&nav=0,2 ) to no avail.

Here is the configuration:

  • CPU: 2.4GHz, Memory: 1.25GB
  • WinXP Pro
  • WinRoute 6.7.1, no antivirus or ISS OrangeWeb filter
  • Nothing else runs on box
  • Task manager shows memory commit charge as 159M/1517M

I have already tried the things in the above linked KB article, including disabling the all URL rules and forbidden words installed by default in the HTTP content filter, and putting a traffic rule at the top of the list for a specific IP so I could run tests which short-circuit all the normal sequence of policy rules.

The throughput remained pretty much the same.

Could my network adapters be that bad? Is a 2.4GHz CPU too slow to get past 20mbps throughput?

Any suggestions?


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The WinXP is a CLIENT OS, who have a connections
limits for simultaneous connected users. It`s a 10 TCP simultaneous connection. Older (and server`s) OSes (like a Vista, Win7) do not have a this connection`s limit`s sa well. Try to a "unofficial patch" named "TCP-IP half-open" (look like this, i can`t remember full name) for your WinXP, and speed normally up as well.

[Updated on: Fri, 04 December 2009 10:01]


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more_4_characters wrote
Try to a "unofficial patch" named "TCP-IP half-open" (look like this, i can`t remember full name) for your WinXP, and speed normally up as well.

Thanks for the suggestion; I had not heard of that before. We installed it and increased the limit from 10 to 200. A download speed test didn't show a change beyond the normal fluctuations in tests.

But I would expect the description of the half-open scenario to make a bigger impact on concurrent usage by multiple users, than a specific download test. Once it has the connection going, I wouldn't expect it be queued again.

So although it hasn't helped a specific test, perhaps it will improve perceived speed by multiple users.

Still looking for other suggestions. Maybe I should try running the software application version on the box?

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WinRoute is know for having some difficulties with certain network adapters, for example with RealTek chip based NIC's.

I have a 50Mbit (up & down) fibre and WinRoute doesn't even break into a sweat when using that bandwith. Xeon 3Ghz CPU never reaches 20% and that is with all bells and whistles turned on (built-in McAfee AV scanning, protocol inspectors, Kerio Web Filtering, DNS resolving for all connections, etc.)
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