Hi, I noticed that my network seemed slow at times (when copying files). I thought I would try to do a little investigation so that I could at least get some baseline numbers for future comparison.
What I have found is rather confusing to me (I know enough about networking to barely be dangerous). I have 3 pcs hooked up together on a 100Mbs switch. Here is the basic setup: PC1 and PC2 have 100Mbs tulip based cards. PC 3 has a 1 Gps gigabyte card using the sk98llin driver. I used iperf to test the speeds between various PCs. Here are the results using iperf: PC3 to PC2 iperf -c blaster ------------------------------------------------------------ Client connecting to blaster, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.123.183 port 33043 connected with 192.168.123.149 port 5001 [ 3] 0.0-10.0 sec 112 MBytes 94.0 Mbits/sec PC1 to PC3 iperf -c sonata ------------------------------------------------------------ Client connecting to sonata, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.123.158 port 32957 connected with 192.168.123.183 port 5001 [ 3] 0.0-10.0 sec 87.0 MBytes 73.0 Mbits/sec PC3 to PC1 iperf -c atlas ------------------------------------------------------------ Client connecting to atlas, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.123.183 port 33041 connected with 192.168.123.158 port 5001 [ 3] 0.0-10.3 sec 408 KBytes 323 Kbits/sec All of the other combinations show results above 74 Mbits/sec. What has me confused is that I can transfer a file from PC1 to PC3 at 73 Mbits/sec, but doing it in the opposite direction (PC3 to PC1), the rate is only 323 Kbits/Sec (although it has been as high as 5.8n Mbits/sec). Does anyone know why transferring files in one direction is 10 to 100 times faster, or if there is some ofther testing I can do to narrow down where the bottleneck is? Thanks, Kevin ps. PC3 is by far the faster PC I have. PC 1 and PC2 are 5 to 7 year old machines. -- [email protected] mailing list
