Sysinternals Homepage
Forum Home Forum Home > Windows Discussions > Troubleshooting
  New Posts New Posts RSS Feed: DPC (Deferred Procedure Calls)
  FAQ FAQ  Forum Search   Calendar   Register Register  Login Login

DPC (Deferred Procedure Calls)
 Post Reply Post Reply Page  <1 464748
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Sadistic09 View Drop Down
Newbie
Newbie


Joined: 19 June 2009
Online Status: Offline
Posts: 1 		  Quote Sadistic09 Quote  Post ReplyReply Direct Link To This Post Topic: DPC (Deferred Procedure Calls)
    Posted: 19 June 2009 at 6:50pm
Adding another reply to the book...
You all seem to have this problem with a 6800 card
I have this problem on Windows 7(FULLY updated and fyi, it is not the beta but the Release Candidate. I know how everybody is eager to say "they're still testing it, it's not finished yet" etc etc, I just wanna share my problem with you all to get more information on this issue) and XP with a geforce 6700 XL card (this card litterly came out of nowhere, day I bought my comp it wasn't even on the nVidia site yet)
changing the reg key doesn't make a bit of difference.
Comp has been running fine for over 3 years
I mean, wtf

This sucks badly
Back to Top
molotov View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 04 October 2006
Online Status: Offline
Posts: 17287 		  Quote molotov Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2009 at 7:16pm
Hi Sadistic09,

Since you're running 7...

Perhaps it would be useful to try capturing an xperf trace.  For Windows 7, download and install the Windows 7 RC1 SDK which contains xperf 4.5.  Find xperf.exe on your system (may need to look for an MSI for the Windows Performance Toolkit and install that first).  Then, from an elevated CMD prompt change to the folder containing xperf.exe and execute:
 xperf -on DiagEasy+PROFILE -stackwalk Profile

Then, just after reproducing the problem, run:
 xperf –d merged.etl

Then, ZIP merged.etl and password protect it.  Upload the ZIP file somewhere, and share the location either publicly or privately.  Share the password privately with those you would have analyze the log.
Daily affirmation:
net helpmsg 4006
Back to Top
Temet View Drop Down
Newbie
Newbie


Joined: 20 June 2009
Online Status: Offline
Posts: 2 		  Quote Temet Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2009 at 10:32am
Hi there. Glad to have found you Big smile

Using DPC Latency Checker, I found a completely different explanation for high DPC percentage: It's the firewall of Kaspersky Internet Security 2009 (8.0.0.454 and also .506) that gets slower over time. The deactivation of the firewall proves it - the DPC Latency drops from a full 15000 microseconds to a mere 120 microseconds -- and all green ever after.

I sent this to the Kaspersky folks but they couldn't work it out as yet. It looks like the firewall gets sort of stuffed over time, but the effect apparently doesn't depend on actual usage of internet apps. Any Ideas?

Temet
Back to Top
molotov View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 04 October 2006
Online Status: Offline
Posts: 17287 		  Quote molotov Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2009 at 6:58pm
Hi Temet,

Do you suspect the KIS firewall to be the cause, or simply affected by some other problem?
Daily affirmation:
net helpmsg 4006
Back to Top
JonMcP View Drop Down
Newbie
Newbie


Joined: 01 June 2009
Online Status: Offline
Posts: 6 		  Quote JonMcP Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2009 at 7:26pm
if it is KIS that causes the trouble, would that explain my DPCs being high only after several minutes of high bandwidth usage, and it returning to useable after a reboot?

I don't use KIS , i use ZoneAlarm; but since ZA = KIS, it would make sense to assume that if it is KIS, it is also ZA that causes the trouble.

I will try it myself and report back.
Back to Top
Temet View Drop Down
Newbie
Newbie


Joined: 20 June 2009
Online Status: Offline
Posts: 2 		  Quote Temet Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2009 at 10:52am
@molotov:

I am sure the KIS firewall is the cause. It didnt show up until the number of guarded programs reached the 600 mark. I could not make out another source, e.g. drivers, as I switched all of them off one by one - no different results altogether. The KIS was my last guess actually ;)

Also, the Kaspersky folks were pretty weak in their responses, like "uninstall SuperAntiSpyware", or, "send us that and that file for examination", where all of those files showed up perfectly clean at virustotal.com; the phone comment was like "security doesnt come free, you have to give something in return". Especially that comment was what nailed it for me, because it means they know it, they cant fix it, and they dont talk about it.

Good enough?

@JonMcP:
Looks very much like it, I would say. The connection between the firewall and the virusscanner means, every single packet of every used protocol is examined. If you cause traffic, this is where scanning time multiplies. The DPCs are sort of a stack that lies before the Interrupts, DPC usage by itself means there is already a congestion in progress.

Get the DPC latency checker (freeware, www.thesycon.de) and examine as has been said earlier in this thread. I'm no hardware pro myself and stll it gave me some good answers to improve on.

I would appreciate it if you post your findings here.

All the best
Temet
Back to Top
molotov View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 04 October 2006
Online Status: Offline
Posts: 17287 		  Quote molotov Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2009 at 10:58am
The DPCs are sort of a stack that lies before the Interrupts
DPCs are used by device driver interrupt service routines to defer less time-critical activity and allow the ISR to complete as quickly as possible.
Daily affirmation:
net helpmsg 4006
Back to Top
molotov View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 04 October 2006
Online Status: Offline
Posts: 17287 		  Quote molotov Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2009 at 3:47am
note: moved jimvierling's discussion into its own topic:
Problem with DPCs, Interrupts
Daily affirmation:
net helpmsg 4006
Back to Top
ellockie View Drop Down
Newbie
Newbie


Joined: 24 October 2009
Online Status: Offline
Posts: 1 		  Quote ellockie Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2009 at 4:48pm
Thank you all for useful tips. I solved this problem!

I run abovementioned DPC Latency checker (free, http://www.thesycon.de/eng/latency_check.shtml) and switched off various deviced on my system in Device Manager.

The problem was with Dell Wireless 1505 Draft 802.11n WLAN Mini-Card.

No problem when it is disabled as I have cable connection with the router, but not sure if I'll be still connect with wireless laptops - don't know much about networking.

My system (1yr old):
Dell Studio (customised) with Intel® Core™ 2 Quad-Core Q9400 Processor
512MB nVidia GeForce 9800GT
Back to Top
molotov View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 04 October 2006
Online Status: Offline
Posts: 17287 		  Quote molotov Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2009 at 11:32am
Hi ellockie,

Unfortunately, it seems that wireless devices or their drivers are not an uncommon cause for issues similar to what you report.  Good to hear you were able to get to the bottom of it!
Daily affirmation:
net helpmsg 4006
Back to Top
 Post Reply Post Reply Page  <1 464748

Forum Jump Forum Permissions View Drop Down

Privacy Statement