DPC (Deferred Procedure Calls)

I know this thread hasn't been active for a little while, but i found it after weeks of hunting through forums looking for the answer to my high DPC usage.

my DPCs spiked whenever my LAN was active - opening a webpage even. the solution for me was to go to the following reg entry
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACPI\Parameters]
and set the "Attributes" DWORD to 100 in hex.  after a reboot, i had no more spikes, FINALLY!!!

i hope this helps someone, as it caused me many weeks of frustration.

my pc:
-Vista Business x64 SP2
-MSI 790GX-G65
-AMD Phenom II 710 @2.6GHz
-6GB Corsair XMS2 DDR3
-ATi Sapphire Radeon HD 4870

Originally posted by JonMcP I know this thread hasn't been active for a little while, but i found it after weeks of hunting through forums looking for the answer to my high DPC usage. my DPCs spiked whenever my LAN was active - opening a webpage even. the solution for me was to go to the following reg entry [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACPI\Parameters] and set the "Attributes" DWORD to 100 in hex.  after a reboot, i had no more spikes, FINALLY!!! i hope this helps someone, as it caused me many weeks of frustration. my pc: -Vista Business x64 SP2 -MSI 790GX-G65 -AMD Phenom II 710 @2.6GHz -6GB Corsair XMS2 DDR3 -ATi Sapphire Radeon HD 4870

Hi Jon

Many many thanks for your post - it looks like this may be the glimmer of hope, to get my Vista Dell Studio 17 back on track for my DAW/DJ set up without horrible digital noise!

My knowledge isn't the most advanced when it comes to in depth programming/hex stuff.

I presume that once I get into  [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACPI\Parameters]  I'd right click>New>DWORD (32-bit) Value...  then what?

Please help!

Ah, thanks guys!

sorry i haven't replied before now, i had presumed i was subscribed to this thread
and i would be emailed when a reply had been posted *embarrassed*

yeah, you were spot on the money with that explanation molotov, i apologise i didn't make it clearer.

unfortunately, after updating windows after the service pack install, the problem seems to have come back - with a worse effect than ever before.  doing anything network related (opening/refreshing a web page, etc) will spike all three cores to 100% and makes my computer unuseable until the webpage has completely loaded; whereupon the DPCs will drop back down to unnoticeable.

a strange thing though - whilst using bittorrent, DPCs will increase and max out one core, but not all three, except when adding a torrent.  i find this perculiar since bittorrent uses more network bandwidth than refreshing a web page.

seems my "fix" was only temporary :(

Sorry guys

Jon

Originally posted by JonMcP more fool me - i should know by now that MS likes to kick me when i think i've fixed something

i should have stuck with linux :(