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  How to fix Vista's network bottlenecks
Time: 00:06 EST/05:06 GMT | News Source: APC Mag | Posted By: Kenneth van Surksum

As much as I enjoy using Vista, I’ve definitely noticed that in some networking activities, it definitely seems to struggle. Particularly compared with Windows XP.

For the most part it’s not a problem – I just assumed that Vista’s beefy network stack was responsible, and made a mental note to fix it at some point. And then forgot.

But recently I encountered a really frustrating problem. Using Remote Desktop Protocol (RDP) to connect from a Vista Enterprise machine to a Windows 2003 server, the performance was so woeful that I was starting to worry whether there was a problem with the server.

All this automatic tuning of the Vista network stack sounds great in theory, but the problem is that some clients don’t support TCP window scaling, or do but don’t have it enabled. Additionally, some firewall products also don’t support it. In either scenario, the result is dropped packets which affects network performance horrendously -- your traffic is literally dropping into a black hole, never to be seen again.

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#1 By 23275 (71.12.191.230) at 9/27/2007 11:52:31 AM
Why not test your router FIRST?!?

Why not do that, and then consider a separate switch for clients [like 20 bucks], up-linking to the router's LAN port?!?!?

Here is Microsoft's free online test tool - with it one may easily see what their router supports,
Internet Connectivity Evaluation Tool http://www.microsoft.com/windows/using/tools/igd/default.mspx

I copied this read from some posts here for re-use opposite articles just like this one,
http://blog.libertech.net/blogs/lketchum/archive/2007/06/23/holy-toredo-vista-networking-rocks.aspx

This post was edited by lketchum on Thursday, September 27, 2007 at 11:54.

#2 By 2960 (68.100.112.199) at 9/27/2007 2:35:40 PM
Nice Article Lloyd.

What's interesting is, not only have I done all of what you wrote there, and even use the networking gear you list (except I use the DGL-4300, still fully Vista compatible), the same switch, etc...

I even went off the on-board Intel NIC, and installed an Intel Pro/1000 MT adapter and...

My networking with Vista still sucks.

I also applied those commands. Don't think it helped much.

I even set up a share between two desktops at GB speed (to keep the slower RAID's and NAS boxes out of the loop) and it didn't get much better.

MS definitely has some work to do here. I'm not sure what, but something :)

I in no way doubt what you say. You're a fairly smart guy :) I just thing there's more to this than any of us understand right now.

TL

#3 By 23275 (71.12.191.230) at 9/27/2007 9:21:13 PM
#2, Thanks, TL. I tried to make it at least informative.

One thing you might look at - short of disabling scaling [W2K3 Server has had this since SP1 and I assess that if scaling issues were at the heart of this, a great many people would be pretty vocal about similar problems in the server family], is the address space you are using internally - opposite the space used by your ISP and the modem/IR Bridge.

Assess the address spaces and if they are the same, then adjust the address space your own router uses to be dissimilar. Say your modem hands out 192.168.0.xxx addresses and your D-Link is doing the same - change the scope your internal router uses to a different range - say 192.168.1.xxx - of course, assign a static 192.168.0.xxx address on your router's external WAN interface.

Doing this will stabilize any issues between the two routing tables at a minimum, and in many cases, it can solve a lot of challenges you are seeing internally.

You've probably already done this, but also consider going over to Wireshark, http://www.wireshark.org/ and installing the utility to look at what is happening on your network. Look specifically at how many applications are listening and how many adapters you have enabled - disable any interfaces not in use and in general, sniff the network for noise. I've seen a single faulty interface bake an otherwise perfect NW.

If you still have problems, I'll post a follow-up and share what we do with certain W2K3 Server interfaces that manifest the same kinds of problems some Vista users are reporting.

#4 By 16797 (65.95.8.238) at 9/28/2007 2:14:35 PM
Agreed, very very informative article. AW should link your blog posts.

Lloyd, would you be able to estimate (%) how many of your clients has switched to Vista or plan to do so before SP1 is released? In other words, is SP1 a big "wait for" thing?

This post was edited by gonzo on Friday, September 28, 2007 at 14:15.

#5 By 23275 (172.16.10.31) at 9/28/2007 6:05:13 PM
#4, Nearly 100% are buying Vista on any new system we ship. Very few exercise downgrade rights in very rare cases - like POS Systems were so much hardware, like check franking machines, have to use kernel mode drivers... for now... there is just no way around that. Do know however, where downgrading is mandated like that, users are not happy. They want Vista and they want it on all machines.

100% were informed and educated about what Vista would mean, and what we planned as part of our continuing efforts to deliver increasing amounts of value - we start small , keep it relevant and then expose key people to what we are doing and on what platform - so there is always more support for what is ahead. In simple terms, we made sure Vista was not a surprise. We also uses business process and benefit to sell in - they save, we save, as we have to respond to issues less frequently.

100% have moved at least a portion of their systems over, and they are eager to move away from XP.

The reasons are simple - users can "FIND" things more easily and more quickly and they can produce things more easily and more quickly. Everything is more visual today, and given our work to present business information in the way of visual intelligence products, our users expect and demand that. Vista is clearly more visual and "Seeing" inside files and folders is especially welcome. We keep it simple and focus on the user - for example, none of our users even know what a UAC event is! They don't see them, because the systems are all set up before they are used! So users have little cause to see a UAC event.

User centricity is so key - so vital. Let me give a simple example - a big customer with a big problem came to us for help. They are in the middle of deploying a brand new and very complex PM SW suite. It has been very tough work - integrating practice management with so much else and the users have been such troopers. The officer manager has Vista and uses it to capture events as they occur. We used a TS auditing program to see "exactly" what was going on server side to report to devs. It got it solved. Vista natively allowed the user to share what was seen and quickly. Now I know this is possible by many means, BUT in Vista it is so easy - snip and in the same control, send - simple and done. The user did not have to "touch" it much and in a couple of nights, we were able to isolate exactly what sequence of user actions were producing show-stopping errors. We've since upgraded all systems to Vista.

And thanks for the kind words. As I promised here in 2004, I'd put a resource out there to help this community that I respect and value so much.

#6 By 37047 (74.101.157.125) at 9/28/2007 7:25:45 PM
Lloyd: I suspect that the main "feature" that is enticing all your customers to use Vista is that you sat down with them and explained things to them, rather than them getting a new system with it installed on it, and having to just into the Vista waters with both feet and blindfolded. It is that extra bit of personal interaction that is likely making all the difference. For that, you are to be commended. That's the kind of service you don't get at Best Buy or wherever else people buy their PCs.

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