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Lan causes CPU dropout cycles

T

tprudd

Junior Member
I'm using XP Pro, and it has no access to the web. I dual boot to a music side that has no installed modem, all extra ports are disables etc. The Lan works fine on the other "Office" side, and in fact it works fine on the music side for tranfering files etc. But if I use any music application that pushed the CPU above 40% the audio glitches with a regular tick every couple of second. As soon as I disable LAN in hardware it's fine. The only Network stuff installed is the Drivers for the LAN and I ran Network setup wizard to link to the other computer.

I've left cubase, my music program, running, gone into Hardware disabled LAN "on the fly" ,so to speak, and everything returns to normal, no Glitches: I can push the CPU right past 90%. What I have noticed though is if I have Windows Task manager running and watch it's CPU usuage readout, when the glitches appear the CPU actually drops to 0 and the jumps back up, so I dont know if its CPU spikes or dropouts. Also it dosent have to be Cubase, it does it on stand alone synths. If I play random notes to get the CPU up to 40-50% your can hear a click every few seconds, but it is a regular pattern of about 2 secs?????..... I've also tried disabling one service at a time going throught the majority of them, but no change.
There are no IRQ conflicts. LAN is on IRQ21

PC Specs
Gigabyte 8INXP (with GIGA LAN built in Intel 82540EM)
2GB Ram
P4 3.06Ghz
3 Western Digital HDs
Win XP PRO


Cheers

 
maybe a pci bus latency issue? try chaing it to a lower or higher number and see if it gets worse/better... thats the only thing I can think of barring a driver problem...

whn you say you disable lan in hardware, what do you mean exactly?
 
Originally posted by: Abzstrak
maybe a pci bus latency issue? try chaing it to a lower or higher number and see if it gets worse/better... thats the only thing I can think of barring a driver problem...

whn you say you disable lan in hardware, what do you mean exactly?
Click to expand...

What I mean by hardware is going to Control Panel/system/hardware/device manager and then disabling the Lan. I forgot to say that LAN is built into the motherboard.
There is a control app for the Intel Lan in control panel with lots of setting for the network port, could it be any of these???

What do you mean by changing the pci bus latency, do you mean for the audio card???



Thanks for you help

 
pci bus latency can usually only be changed in the bios.

Have you tried downloading that newest drivers from intel for the NIC?
 
Thanks Abzstrak,

I have tried intel, but they just say go to your motherboard manufacturer for drivers, which I have.

Two questions though, my PCI cards are at 33, wont it damage them if I try to change this to 66???
(Cards installed are Echo MIA Audio Card, SB Live Player(disabled in system), & AGP Creative TI4800

The other thing is I found this PDF
http://www.intel.com/design/network/applnots/8254x_ap450.pdf

It talks about the LAN interrupting the CPU to send packets could it be this.

What I dont understand is that they apperar to be CPU drop outs. The Task manager CPU monitor shows 40% then it dropping suddenly to 0 then back up to 40% while I'm playing. It looks like a terrace of ups and downs...........

Thanks for your help - I'm used to setting up music PC's but LAN is a bit new to me!!!

 
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