Messages in this thread |  | | Date | Tue, 25 Sep 2001 18:38:31 -0300 | From | Chris Newton <> | Subject | RE: excessive interrupts on network cards |
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Yea, it is a single port card... I had meant to mention that in the email I sent out... ie: that it wasn't reporting correctly... but, I didnt really think it was related, since the eepro was doing the same thing.
As for comparing with ifconfig, I ran 'watch 1 ifconfig -a', and sure enough, I have about ~7000-7500 packets coming in right now. And, the 'procinfo -D', reports ~21000-22000 interrupts per second.
Other sources I have used to confirm packet rate... include output from 'sniffer', a flow generator that was monitoring that link, and the hub this machine is plugged into.
the hub has 3 active ports.. port 1 is one side of our internet conenction (out to our provider), port 2 was from the hub over to our main router... port 3 is a mirror of the IN on port 1 and the OUT on port 2 to port 3. Comparing, and verifying, showed port 3 getting 10K packets (this afternoon, which obviously drops at night, which it is here now), and down to 7K now.
Chris
>===== Original Message From Andrew Morton <akpm@zip.com.au> ===== >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.
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