Messages in this thread | | | Date | Tue, 20 Apr 2004 11:41:08 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: NIC inerrupt |
| |
On Tue, 20 Apr 2004, Axel [iso-8859-15] Weiß wrote:
> Am Montag, 19. April 2004 14:46 schrieb John Que: > > Hello, > > > > I want to count the number of times I reach an NIC receive > > interrupt. > > > > I added a global static variable of type int , and initialized > > it to 0 ; each time I am in the rx_interrupt of the card I incerement > > it by one; > > I got large , non sensible numbers after one or two seconds; > > > > So for debug I added printk each time I increment it in rx_interrupt. > > > > What I see is that there are unreasonable jumps in the number > > > > for instance , it inceremnts sequntially from 1 to 80,then jums to 4500, > > increments a little sequentially to 4580, and the jums again to > > 11000 ; > > > > Is it got to do with it that this is in interrupt? > > Any idea what it can be ? > > > > > > (I also tried to declare it as static in the rx_interrupt method > > and the same happened) > > Probably you didn't declare your count variable 'volatile'? > > Axel > > -- > Humboldt-Universität zu Berlin > Institut für Informatik > Signalverarbeitung und Mustererkennung > Dipl.-Inf. Axel Weiß > Rudower Chaussee 25 > 12489 Berlin-Adlershof > +49-30-2093-3050
How about `cat /proc/interrupts`. That should tell him how many interrupts the NIC got..
CPU0 0: 123073 IO-APIC-edge timer 1: 1131 IO-APIC-edge keyboard 2: 0 XT-PIC cascade 17: 18550 IO-APIC-level BusLogic BT-958 18: 69272 IO-APIC-level eth0 <---------- NMI: 0 LOC: 123029 ERR: 0 MIS: 0
Do the simple stuff first. Only get compilcated if necessary.
Cheers, Dick Johnson Penguin : Linux version 2.4.26 on an i686 machine (5596.77 BogoMips). Note 96.31% of all statistics are fiction.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |