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ethtool might help getting the Speed/Duplex settings for that interface
on the server: e.g. ethtool eth0 -Azher Brandon Ewing wrote: This is a strange issue that I have noticed on a 3560G that we have deployed. We have two servers, on different ports, controlled by different ASICs. Each port negotiates a 1000mb/s link, but I cannot get more than 11MB/s (88mb/s) of traffic between the two ports. I conducted the following tests:Transferring a 1GB file from one server to the other, written to /dev/null Single transfer averaged 11.2MB/s Performed two simultaneous transfers from one server to the other, written to /dev/null. One transfer completed at 2MB/s, the other at 9.3MB/s. This happens consistently, every test. Performed two simultaneous transfers -- one between the two servers on the switch, and one from another server off-switch to one of the servers. Both transfers maxed out at 11MB/s This doesn't appear to be a TCP windowing issue, due to the fact that doubling the number of TCP sessions did not result in a net increase of overall speed. It appears that any flow in between two ports can only reach 100mb/s. Anyone have any idea where I can look to find the root cause? -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. |
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