WAAS slows traffic down

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Hello -

We have WAAS in a test lab and we have configured it using policy-based routing. We are running the standard test (HTTP to get a file), but when we browse to get the file, and click to download it, the transfer on a FastEthernet port starts off at 20k, then falls to nearly zero.

If we remove the PBR, the file (70 MB) tranfers very quickly. There are only two hosts on this testbed.

The WAAS is showing "compression" and such for HTTP.

Please advise! : )

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Zach Seils Wed, 01/30/2008 - 06:43
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Do you see any interface errors on the WAEs or connected devices?

What interception method(s) are you using?

Do you see poor performance with other types of traffic, or just HTTP?


richardb115 Wed, 01/30/2008 - 09:41
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What's the latency between your test branch and core WAEs? If it's around 4ms or less, the optimisation takes longer than the corresponding time saved, so performance is actually worse.

It's just staged right now, so it's all in one room with FastEthernet connecting them, so the latency is probably 1 - 2 ms. We are mostly just testing policies and stuffs right now.

I was planning on putting some rate-limiting between the routers to slow traffic down to see the WAAS improvement. You think I need this now?

I just found it kinda hard to believe that even with 100 MB between the routers, that the WAAS would slow traffic down to as low a 1k sometimes.

Thanks for the help!!! : )

Hello -

The WAAS is still slow. It's version 4.0.15.b.6 and we even configured HTTP for pass-through (to see if policies were the cause) and when we transfer the file, it starts off at 60k and works it's way down to 20, then 12, then 3, and lower. We converted to WCCP, and redirect everything and whenever any traffic goes through the WAEs, this is the result.

Any ideas? I'm out of them. : )

richardb115 Thu, 01/31/2008 - 14:10
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Can you try CIFS instead of HTTP? Is that slow too, that is, is all traffic behaving the same way?


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