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Windows 7: Very high response time

20 Sep 2009   #1
Ponen

Windows 7
 
 
[SOLVED] Very high response time in Win7 64bit

Hello.
I've just moved from an apartment where I used to have a 100mbit fibre connection and at my current place I've got a 15mbit/1mbit connection. The problem is that I have an extremely high ping and it's definitely a local problem since another machine (running XP) has a normal ping of 10ms to the local station we measure with. I had about 500+.

If I enter Safemode with networking everything is fine and my ping is really low. Therefore I thought it could be something with the Firewall so I turned them off (Win7 FW + Comodo 64bit Internet Security) but there was no difference.

I tried disabling Nagle's algorithm but it didn't do any difference either.. And, well, now I'm kind of out of ideas. Anyone want to share some with me?

Thanks!
Ponen

P.S.: I'm using Windows 7 Ultimate 64-bits

Oh and also, before I moved I was playing around some with Nagle's algorithm (instructed by SpeedGuide.net :: Windows Vista / 2008 Tweaks) but without any results at all.. I found that page again and I'm pretty sure I have undone everything I did that time. The steps I followed was "Gaming Tweak - Disable Nagle's Algorithm"

Here's my speedtest results:



Problem solved, obviously my Comodo Firewall was causing some problems and when I had uninstalled it, everything worked like a charm.





My System SpecsSystem Spec
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20 Sep 2009   #2
H2SO4

Win7x64
 
 

Make sure you uninstall Comodo rather than just disabling it. "Disabling" to a FW means "I'd like you to do whatever you feel like in response to my 'OFF' command". Enterprise-level firewalls actually go into lockdown mode when you disable their control interfaces - literally nothing gets in or out.

After that, you might want to try uninstalling your anti-virus as a test. Your culprit is very probably a kernel-mode driver like those FW solutions. Once you're confident it's not the FWs, the AV is the next logical suspect.

Also, nagling happens at the transport layer (TCP) and it therefore has no impact whatsoever on latency at the low network level (ICMP). I'd suggest you put those settings back the way you found them, otherwise you may produce other weird and wonderful symptoms which are difficult to troubleshoot
My System SpecsSystem Spec
20 Sep 2009   #3
Ponen

Windows 7
 
 

Thanks for the answer sulphuric acid, I'm going to try that right away.
Although I doubt it's my AV since I'm using Nod32 and it shouldn't do anything at all to my internet connection. Atleast that's what I think but I'll still try it out!

Also, check out the speedtest picture I posted in my first post. Insane. :P

Thanks again for your time
My System SpecsSystem Spec
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20 Sep 2009   #4
Ponen

Windows 7
 
 

Okay, that's weird. Obviously, it was Comodo delaying the packets or something because it worked wonderfully after it was uninstalled.

Thanks _A LOT_ h2so4

Weird tho, I tried to first disable comodo FW, exit the program and then close it's processes and sure, I still had internet connection but there wasn't any difference. So thanks again, without you I wouldn't have thought it out
My System SpecsSystem Spec
20 Sep 2009   #5
H2SO4

Win7x64
 
 

Quote   Quote: Originally Posted by Ponen View Post
Okay, that's weird. Obviously, it was Comodo delaying the packets or something because it worked wonderfully after it was uninstalled.

Thanks _A LOT_ h2so4

Weird tho, I tried to first disable comodo FW, exit the program and then close it's processes and sure, I still had internet connection but there wasn't any difference. So thanks again, without you I wouldn't have thought it out
No problem, glad to hear it worked.

Perhaps the (over-simplified) diagram I attached might help to explain what is happening. The firewall's (FW's) configuration interface(s) and service(s) is the yellow blob up in user-mode. That's what you're closing down when you exit the program and end-task its services. However, note that those processes have (had) a private form of communication (red line) down to a FW driver in kernel-mode (red blob), and you cannot easily get rid of the driver without uninstalling the FW application.

How the driver behaves once its line of communication to its configuration services is severed is entirely driver-specific. In some cases they will disengage completely, or they might continue to "inspect" the traffic flowing through them without dropping anything, or they might panic and stop all traffic flow. In your case, the FW driver was obviously still active to an extent, and its handling of en-route traffic to and from apps like ping.exe and your games (blue line) was causing perceptible delays.

(When people ask me what I like best about Win7 I say 'the new mspaint' )


Attached Images
Very high response time-fwdiag.png 
My System SpecsSystem Spec
19 Oct 2009   #6
cha0tic

Windows 7 RC1 x64 (Build 7100)
 
 

Hey Guys. I have the exact same issue.

When I installed Comodo Internet Security my ping went up (~500ms) on speedtest.net (just like the original poster), but my ping batch file (ping -t Google) would still have great response time. After reading similar issues with Comodo IS, x64 edition on Windows 7, I uninstalled it. My speedtest.net and browsing latency went back to normal. But then when I installed Malwarebytes' Anti-Malware, the latency went back up to ~500ms.

Could this be a TCP issue (as ICMP seems to be unaffected)? The only thing that is weird (besides the issue itself) is that this affects my games as well (most use UDP). L4D, TF2 and several others have at least double the latency with this issue. I have tried reinstalling Comodo IS and then uninstalling it, but I can't seem to recreate the same fix.

Any ideas on how to fix this? Or any ideas as to the underlying cause?
My System SpecsSystem Spec
19 Oct 2009   #7
H2SO4

Win7x64
 
 

Quote   Quote: Originally Posted by cha0tic View Post
Could this be a TCP issue (as ICMP seems to be unaffected)?
In the sense that the presence of the FW driver only negatively impacts transport-layer communication (TCP & UDP) - yes.

It gets very complex down there in the kernel-mode network stack. Firewall drivers are not all similar with respect to architecture. Bugs in a driver may easily affect only one layer (transport) or even one protocol type.

Quote   Quote: Originally Posted by cha0tic View Post
The only thing that is weird (besides the issue itself) is that this affects my games as well (most use UDP).
"Weird" is par for the course with these issues

Quote   Quote: Originally Posted by cha0tic View Post
Any ideas on how to fix this? Or any ideas as to the underlying cause?
Deterministically troubleshooting something like this is hard; it would be best left to the Comodo developers.

Is the product certified for use with Win7? If not, there may be real technical reasons why it's still unsuitable.

Have you tried testing what happens with a clean OS install and just Comodo? It's possible that interplay with other so-called "NDIS Intermediate" filter drivers is the cause.

If it happens on a clean install and you've paid money for the firewall product, perhaps the developers would be willing to act on your problem report. Otherwise, I'd suggest just finding a (win7 certified) solution that does work for you.

BTW, there's absolutely nothing wrong with the built-in Windows firewall.
My System SpecsSystem Spec
19 Oct 2009   #8
cha0tic

Windows 7 RC1 x64 (Build 7100)
 
 

Well it seems like I'll need to try Comodo (free btw) on a fresh install on my server. On Comodo's site, they even state that their firewall is W7 compatible, so this issue kind of irks me.

Anyway, I'll see what happens on a fresh install and get back to you. Thanks!

Quote   Quote: Originally Posted by H2SO4 View Post
BTW, there's absolutely nothing wrong with the built-in Windows firewall.
I know, but I like Comodo's GUI and I had an issue with some ARP poisoning on my network and Comodo was a bit of an easier fix.
My System SpecsSystem Spec
19 Oct 2009   #9
cha0tic

Windows 7 RC1 x64 (Build 7100)
 
 

I havn't tried a fresh install yet, but I found another oddity.



The Grant's Pass server has much lower latency than all other servers.

Examples:


My System SpecsSystem Spec
15 Sep 2010   #10
quanzaboy

Windows 7 Ultimate x64 (SP1)
 
 

Thanks for this post! This is exactly the issue that I had and have spent the last 2 days on the phone with my ISP trying to figure it out! Who would have known that simply disabling comodo firewall is not enough and you need to do a full uninstall in order to fix this issue.

In the meantime I've taken the liberty of posting about this on the COMODO forums. Hopefully someone there will offer a fix to this issue thus enabling the use of COMODO Firewall with Windows 7 and without suffering these connection performance issues.

For anyone who's interested the post can be found here:
https://forums.comodo.com/firewall-h...-t61798.0.html
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 Very high response time




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