My configuration is two Dell Optiplex PCs ( /proc/cpuinfo attached) connected back to back.. I am using the vanilla 2.6.14.3 kernel, and using the e1000 driver for the onboard Intel PRO 1000 Ethernet Card on both machines. I am performing both Full and Half Duplex Data Transfer and the figures which I am getting are abysmal.. Full Duplex Data Transfer ( Both send and receive ) Ettcp Send - 55167.45 KB/sec Ettcp Receive - 54902.49 KB/sec Total Throughput ~ 110MB/sec CPU IDLE - 55 percent Half Duplex Data Transfer ( Sending from one host to another ) Total Throughput = 103 MB/Sec CPU IDLE - 65 percent Now, I assume that on Gigabit ethernet, I should be getting Line Rate, which is around 220 MBps. Even the CPU is not getting max-ed out here and I am at a loss to understand this behaviour. Please find the ethtool dump, and the ettcp send and receive dumps for both full and half duplex transfers Regards, Ashutosh
[root@kir9060 root]# ettcp -s -r ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp nttcp-r: socket ttcp-r: accept from 192.168.80.15 User: 2249 Nice: 58 System 1694 Idle:111197 Params:4 User: 2278 Nice: 58 System 2250 Idle:114639 Params:4 User_diff: 29 Nice_diff: 0 System_diff: 556 Idle_diff:3442 Tot:4027 User: 0.720139 System: 13.806804 Nice 0.000000 Idle:85.473057 nttcp-r: Buflen:8192 SysLoad:13.81% 3373203456 bytes 60.00secs =54902.49 KB/sec nttcp-r: 627033 I/O calls, msec/call = 0.10, calls/sec = 10450.57 nttcp-r: 0.2user 6.9sys 1:00real 12% 0i+0d 0maxrss 0+15pf 448574+141csw
[root@kir9060 root]# ettcp -s -t -i 60 -l 65536 192.168.80.15 ttcp-t: buflen=65536, nbuf=2048, align=16384/0, port=5001 tcp -> 192.168.80.15nttcp-t: socket nttcp-t: connect User: 2249 Nice: 58 System 1673 Idle:110852 Params:4 User: 2275 Nice: 58 System 2206 Idle:114417 Params:4 User_diff: 26 Nice_diff: 0 System_diff: 533 Idle_diff:3565 Tot:4124 User: 0.630456 System: 12.924345 Nice 0.000000 Idle:86.445199 nttcp-t: Buflen:65536 SysLoad:12.92% 3389521920 bytes 60.00secs =55167.45 KB/secnttcp-t: 51720 I/O calls, msec/call = 1.19, calls/sec = 861.99 nttcp-t: 0.0user 2.5sys 1:00real 4% 0i+0d 0maxrss 0+27pf 51415+35csw
[root@kir9060 root]# ettcp -s -t -i 60 -l 65536 192.168.80.15 ttcp-t: buflen=65536, nbuf=2048, align=16384/0, port=5001 tcp -> 192.168.80.15nttcp-t: socket nttcp-t: connect User: 2337 Nice: 58 System 2590 Idle:134970 Params:4 User: 2344 Nice: 58 System 2906 Idle:139352 Params:4 User_diff: 7 Nice_diff: 0 System_diff: 316 Idle_diff:4382 Tot:4705 User: 0.148778 System: 6.716259 Nice 0.000000 Idle:93.134963 nttcp-t: Buflen:65536 SysLoad:6.72% 6341132288 bytes 60.00secs =103207.73 KB/secnttcp-t: 96758 I/O calls, msec/call = 0.63, calls/sec = 1612.62 nttcp-t: 0.0user 3.2sys 1:00real 5% 0i+0d 0maxrss 0+27pf 96136+2csw
processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 9 cpu MHz : 2793.594 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5593.94
Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on Supports Wake-on: umbg Wake-on: g Current message level: 0x00000007 (7) Link detected: yes
