CPU running continuously at 90% on one core
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From: Lorne on 6 Jul 2010 06:21 I have Windows 7 home premium running on an AMD X6-1055 6 core processor. If I start Windows and leave it doing nothing except the background processes loaded at boot time the CPU runs continuously at 14/15%. When I inspect task manager it tells me system idle process is 99%, and none of the 80 running processes register above 0%, but at the bottom CPU use is still 14%+. When I look at the performance tab one processor (always the same one) is running at 85-90% and the others near zero. When I use a motherboard utility it shows the same thing - one processor at 85%+ and the others near zero. How do I find out what is running to cause this when task manager does not show the process? I have run Malwarebytes - it shows nothing unpleasant on the computer.
From: poutnik on 6 Jul 2010 07:41 In article <eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl>, lorne_anderson(a)hotmail.com says... > > I have Windows 7 home premium running on an AMD X6-1055 6 core processor. > If I start Windows and leave it doing nothing except the background > processes loaded at boot time the CPU runs continuously at 14/15%. > > When I inspect task manager it tells me system idle process is 99%, and none > of the 80 running processes register above 0%, but at the bottom CPU use is > still 14%+. > > When I look at the performance tab one processor (always the same one) is > running at 85-90% and the others near zero. > > When I use a motherboard utility it shows the same thing - one processor at > 85%+ and the others near zero. > > How do I find out what is running to cause this when task manager does not > show the process? I have run Malwarebytes - it shows nothing unpleasant on > the computer. Try to run Process Explorer by Sysinternals (now Microsoft), as elevated admin. I guess Win Task Manager need not to show all, PE may show more processes. http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx -- Poutnik The best depends on how the best is defined.
From: Lorne on 6 Jul 2010 08:02 "Lorne" <lorne_anderson(a)hotmail.com> wrote in message news:eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl... > I have Windows 7 home premium running on an AMD X6-1055 6 core processor. > If I start Windows and leave it doing nothing except the background > processes loaded at boot time the CPU runs continuously at 14/15%. > > When I inspect task manager it tells me system idle process is 99%, and > none of the 80 running processes register above 0%, but at the bottom CPU > use is still 14%+. > > When I look at the performance tab one processor (always the same one) is > running at 85-90% and the others near zero. > > When I use a motherboard utility it shows the same thing - one processor > at 85%+ and the others near zero. > > How do I find out what is running to cause this when task manager does not > show the process? I have run Malwarebytes - it shows nothing unpleasant > on the computer. I made some progress. I found windows system monitor and it shows me that the cpu usage is caused by system interrupts. What I now need is to work out which interrupt is causing the problem. any idea how to do that?
From: Lorne on 6 Jul 2010 12:18 "Lorne" <lorne_anderson(a)hotmail.com> wrote in message news:##TfZMQHLHA.5920(a)TK2MSFTNGP05.phx.gbl... > "Lorne" <lorne_anderson(a)hotmail.com> wrote in message > news:eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl... >> I have Windows 7 home premium running on an AMD X6-1055 6 core processor. >> If I start Windows and leave it doing nothing except the background >> processes loaded at boot time the CPU runs continuously at 14/15%. >> >> When I inspect task manager it tells me system idle process is 99%, and >> none of the 80 running processes register above 0%, but at the bottom CPU >> use is still 14%+. >> >> When I look at the performance tab one processor (always the same one) is >> running at 85-90% and the others near zero. >> >> When I use a motherboard utility it shows the same thing - one processor >> at 85%+ and the others near zero. >> >> How do I find out what is running to cause this when task manager does >> not show the process? I have run Malwarebytes - it shows nothing >> unpleasant on the computer. > > I made some progress. I found windows system monitor and it shows me that > the cpu usage is caused by system interrupts. What I now need is to work > out which interrupt is causing the problem. any idea how to do that? An interesting additional effect is that if I put the computer into sleep mode and wake it up the problem disappears - cpu down to 1 or 2% and use of cpu by interrupts under effectively zero. Does anybody have detailed knowledge of what sleep mode actually does that may change the behavior of interrupts?
From: Nunya on 6 Jul 2010 18:33 On Jul 6, 9:18 am, "Lorne" <lorne_ander...(a)hotmail.com> wrote: > "Lorne" <lorne_ander...(a)hotmail.com> wrote in message > > news:##TfZMQHLHA.5920(a)TK2MSFTNGP05.phx.gbl... > > > > > "Lorne" <lorne_ander...(a)hotmail.com> wrote in message > >news:eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl... > >> I have Windows 7 home premium running on an AMD X6-1055 6 core processor. > >> If I start Windows and leave it doing nothing except the background > >> processes loaded at boot time the CPU runs continuously at 14/15%. > > >> When I inspect task manager it tells me system idle process is 99%, and > >> none of the 80 running processes register above 0%, but at the bottom CPU > >> use is still 14%+. > > >> When I look at the performance tab one processor (always the same one) is > >> running at 85-90% and the others near zero. > > >> When I use a motherboard utility it shows the same thing - one processor > >> at 85%+ and the others near zero. > > >> How do I find out what is running to cause this when task manager does > >> not show the process? I have run Malwarebytes - it shows nothing > >> unpleasant on the computer. > > > I made some progress. I found windows system monitor and it shows me that > > the cpu usage is caused by system interrupts. What I now need is to work > > out which interrupt is causing the problem. any idea how to do that? > > An interesting additional effect is that if I put the computer into sleep > mode and wake it up the problem disappears - cpu down to 1 or 2% and use of > cpu by interrupts under effectively zero. > > Does anybody have detailed knowledge of what sleep mode actually does that > may change the behavior of interrupts? Sounds like motherboard level or OS level CPU slowdown protocols being implemented. IOW, 10% use at full speed is easy, whereas 10% use when the CPU is clocked down 80% is quite a lot of work for it.
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