DPCs causing 100% processor usage at random times sebbelcher 13.07.2007 14:38:01 This has just started happening today, nothing new has been added to my system and I havent installed ANY new software for a few weeks (except Windows updates of course). At random intervals, for periods lasting up to 15mins a process called DPCs (as shown in Process Explorer) will use 100% of core processing time. Luckily I have a dual core system so this does not completly hang my computer, it does however make it painfully slow to use, opening a Windows explorer window will take anything from 5 seconds to 30 seconds. I can discern no common trigger for the start of these full load periods, similarly they stop just as suddenly after a seemingly random period. A quick Google shows many people with this problem (Deffered Procedure Calls) but 99% are on XP. Most say it is a hardware issue, but I cannot see a reason for this, my hardware has been stable and unchaged for many months. Anyway as a check I removed, cleaned and reseated all components, but the problem remains as before. Others say it is a temperature related thing, but my CPU, motherboard and GFX card are well within their acceptable limits. 46, 38 and 51 degrees celcius respectively. I cannot confirm the temperature of my RAM but to the touch it is much cooler than the cpu, so I don't think that can be overheating. What are deffered procedure calls? What events cause them? What would cause DPCs to use 100% of processor time? Help!

Re: DPCs causing 100% processor usage at random times "Spirit" <noone[ at ]notthere.net> 13.07.2007 15:02:55 maybe this helps, also think audio drivers, network adapters, and so on. http://www.thesycon.de/deu/latency_check.shtml "sebbelcher" <sebbelcher[ at ]discussions.microsoft.com> wrote in message news:4508C7F7-3F7F-4B2E-9DF1-9DF8E1F9743A[ at ]microsoft.com... [Quoted Text] > This has just started happening today, nothing new has been added to my > system and I havent installed ANY new software for a few weeks (except > Windows updates of course). > > At random intervals, for periods lasting up to 15mins a process called > DPCs > (as shown in Process Explorer) will use 100% of core processing time. > Luckily I have a dual core system so this does not completly hang my > computer, it does however make it painfully slow to use, opening a Windows > explorer window will take anything from 5 seconds to 30 seconds. > > I can discern no common trigger for the start of these full load periods, > similarly they stop just as suddenly after a seemingly random period. > > A quick Google shows many people with this problem (Deffered Procedure > Calls) but 99% are on XP. Most say it is a hardware issue, but I cannot > see > a reason for this, my hardware has been stable and unchaged for many > months. > Anyway as a check I removed, cleaned and reseated all components, but the > problem remains as before. Others say it is a temperature related thing, > but > my CPU, motherboard and GFX card are well within their acceptable limits. > 46, 38 and 51 degrees celcius respectively. I cannot confirm the > temperature > of my RAM but to the touch it is much cooler than the cpu, so I don't > think > that can be overheating. > > What are deffered procedure calls? What events cause them? What would > cause > DPCs to use 100% of processor time? > > Help!