You need to stop sharing the interrupt somehow since you'll never be able to tell which device is causing the interrupts you want to stop. Also, the e1000 driver you are usin gis very old. Us the latest one from our Sourceforge site, http://e1000.sf.net.
You could also try disabling the NVIDIA NIC in the BIOS to see what that does. Cheers, John ----------------------------------------------------------- "...that your people will judge you on what you can build, not what you destroy.", B. Obama, 2009 -----Original Message----- From: Azeem Khan [mailto:[email protected]] Sent: Friday, April 17, 2009 9:45 AM To: [email protected] Subject: [E1000-devel] help understand origin of spurious interrupts Hello everyone, I see almost 80% spurious interrupts inside the e1000 irq handler (e1000_intr) when receiving frames. NAPI is enabled and functional. Please help me understand why. Here are more details. Configuration: -------------- I have a PC with an onboard NVIDIA GbE NIC and a Intel 82540OEM NIC in a PCI slot. Coincidentally, both of them are sharing IRQ 11. I am using ver 6.3.9 of the e1000 driver. The NVIDIA driver is not NAPI enabled afaik. Linux kernel version 2.6.16.13. Processor is AMD Opteron @ 2GHz. IP Forwarding is enabled. Execution: ------------ For performance analysis, I send small packets (64 bytes) at rates of 200Kpps into the Intel NIC which is routed through the NVIDIA NIC to the other network. What I observe is that for 3 million packets, about 1.1 million interrupts are being handled by e1000_intr(). Deeper analysis (I added some code) shows that about 22% of these are the timer RXT0 interrupts. The remainder are not destined for the Intel NIC (since the icr variable set earlier in e1000_intr() contains the value 0x0). To confirm, I added a counter which shows that 78% of the times, e1000_intr() returns IRQ_NONE i.e. the interrupt register does not have any bits set at all. How can this be? I mean, where are all these interrupts coming from? And why is the e1000 driver being asked to handle the interrupt when no bits in the register are set? This is seriously affecting peak packet throughput of my router. So please help me out. Azeem Khan Mumbai _________________________________________________________________ The new Windows Live Messenger. You don't want to miss this. http://www.microsoft.com/india/windows/windowslive/messenger.aspx ------------------------------------------------------------------------------ Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel
