[95467] in North American Network Operators' Group
Re: TCP and WAN issue
daemon@ATHENA.MIT.EDU (Roland Dobbins)
Tue Mar 27 18:02:08 2007
In-Reply-To: <230992.96805.qm@web30810.mail.mud.yahoo.com>
From: Roland Dobbins <rdobbins@cisco.com>
Date: Tue, 27 Mar 2007 14:58:13 -0700
To: nanog <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
On Mar 27, 2007, at 2:41 PM, Philip Lavine wrote:
> This is the exact issue. I can only get between 5-7 Mbps. So the
> question is really what incremental performance gain do WAN
> accelerators/optimizers offer?
I don't know if you'd get much of a performance benefit from this
approach. Bandwidth savings, possibly, depending upon your
application. We have a box called a WAAS which is a WAN optimizer,
so do several other vendors (search online for 'wan optimizer' or
'wan optimization', you should get a lot of hits), but I have no
experience with these types of boxes.
> Can registry/OS tweaks really make a significant difference because
> so far with all the "speed enhancements" I have deployed to the
> registry based on the some of the aforementioned sites I have seen
> no improvement.
I'm not a Windows person, so I don't know the answer to this; I know
you can do a fair amount of optimization with other OSes, depending
upon the OS and your NICs. The MTU, MSS, window-size stuff mentioned
previously all applies, as do jumbo frames, if your end-stations and
network infrastructure support them.
What you want to see is large packets, as large as your end-to-end
infrastructure can support.
> I guess I am looking for a product that as a wrapper can multiplex
> a single socket connection.
Your application should be able to do that, potentially, and as other
folks mentioned, your app can potentially be tweaked to open up
multiple connections. I think there are also NICs which do something
of this sort, but it's not something I've personally used (maybe
others have experiences they can relate?).
My general advice would be to look at all the things mentioned
previously you can potentially do with your existing OSes, network
infrastructure, and apps, and do them prior to looking at specialized
boxes.
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Roland Dobbins <rdobbins@cisco.com> // 408.527.6376 voice
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