Statistical Counters A brief look at our Intel gigabit ethernet network controller s event counting registers Statistics registers The 82573L has several dozen statistical counters which automatically operate to keep track of significant events affecting the ethernet controller s performance Most are 32 bit read only registers and they are automatically cleared when read Your module s initialization routine could read them all to start counting from zero Initializing the nic s counters The statistical counters all have addressoffsets in the range 0x04000 0x041FF You can use a very simple program loop to clear each of these read only registers Here io is the virtual base address of the nic s i o memory region int r clear all of the Pro 1000 controller s statistical counters for r 0x4000 r 0x41FF r 4 ioread32 io r A few counter examples 0x4000 0x400C 0x4014 0x4018 0x4048 0x404C 0x4050 0x4054 0x4074 0x4078 0x407C 0x40D0 0x40D4 0x40F0 0x40F4 CRCERRS RXERRC SCC ECOL XONRXC XONTXC XOFFRXC XOFFTXC GPRC BPRC MPRC TPR TPT MPTC BPTC CRC Errors Count Receive Error Count Single Collision Count Excessive Collision Count XON Received Count XON Transmitted Count XOFF Received Count XOFF Transmitted Count Good Packets Received Broadcast Packets Received Multicast Packets Received Total Packets Received Total Packets Transmitted Multicast Packets Transmitted Broadcast Packets Transmitted A few 64 bit counters Some of the events being counted by the NIC occur too frequently for a 32 bit count to provide reliable accuacy i e overflow In such cases a pair of adjacent registers provides the upper and lower halves of a 64 bit i e quadword statistical counter E1000 TORL E1000 TORH E1000 TOTL E1000 TOTH Total Octets Received Low Total Octets Received High Total Octets Transmitted Low Total Octets Transmitted High Our nicstats c module We wrote this kernel module for easily viewing the statistical counter values cat proc nicstats It led us to the discovery of one mystery counter not mentioned in Intel s manual Can you solve that mystery nicstats2 c This enhanced version of our nicstats c module shows names of all the counters It uses some programming ideas that you may find useful in case you wish to create your own Linux software tools for studying some other hardware devices in the future ACM Event Tonight s class will conclude early so that students can attend tonight s event which our ACM Student Chapter has organized 823 Clement Street near 9th Ave San Francisco CA 94118 Cost is 7 per person
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