Mailinglist Archive: opensuse (2731 mails)

[Robert Amodeo <ra@xxxxxxxxxxxxx>]

Jim,

Thanks for your response.

Date: Tue, 5 Aug 2003 14:40:18 -0700 (PDT)
From: Jim Cunning <jcunning@xxxxxxx>

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How do you know the NIC _isn't_ operating at 1000FD?

>> I ran an iperf tool between 2 machines (both running SuSE 8.0+,
>> both with Intel GB NIC cards), and the transfer rate was 190Mb/sec
>> instead of something closer to 1000 (even 500 would be good).
>> However, you do have a point.  The link lights on both cards
>> indicated GB, as did the ports of the GB switch they were plugged
>> into.  I just wanted to rule out the possibility that the OS doesn't
>> speak the same language as the NIC card

The txqueuelen doesn't have anything (directly) to do with the negotiated
speed on your NIC.  The man page for 'ifconfig' says

       txqueuelen length
              Set the length of the transmit queue of the device.
              It is useful to set this to small values for slower
              devices  with a high latency (modem links, ISDN) to
              prevent fast bulk transfers from disturbing  inter
              active traffic like telnet too much.


>> Yes - at one point during my testing, the value of txqueuelen auto'd to
>> 1000 (instead of 100), so it made me suspicious of the OS's
>> interpretation of the speed.