Messages in this thread |  | | Date | Tue, 25 Sep 2001 13:01:53 -0700 | From | Andrew Morton <> | Subject | Re: excessive interrupts on network cards |
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Chris Newton wrote: > > Hi, > > I 'think' the number of interrupts being generated for the network traffic I > monitor, is excessive. Having talked quikly with Donald Becker, he indicated > that I should be seeing a little less than the number of RX/TX packets/s on a > wire, in terms of interrupts/s. That, however, is not what I am seeing. I am > seeing 3 times as many interrupts/s as I am seeing packets/s. > > I have used three network devices to look at the stream I am monitoring, and > it is usually aorund 5K packet/s IN, and 5K out, fed full duplex into a single > 3Com 3c982 (2.4.10 kernel reports that anyways). However, watching:
3c982 is a dual-port server NIC. Is your card dual-port? If not, it's probably a 3c980, and I goofed :)
> 'procinfo -D', reports on the order of 30,000 interrupts per second.
That does sound rather high. You should compare the interrupt rate with the packet rate from `ifconfig' or /proc/net/dev.
Normally, 3c59x will show approx three Tx packets per interrupt and one Rx packet per interrupt. It varies with workload, but it tends to vary in the "good" direction - at higher packet rates, we do more work in a single interrupt and the interrupt-per-packet rate falls. - 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/
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