Re: ure0: Questionable Performance

[matthewd%fastmail.us@localhost]

> From other comments, it seems like this device is just not that good.

Yes :-)  I have two in case someone wants one!

I have since purchased an axen(4) device and am seeing improved performance.

> The only suggestions I would have to debug it are:
>
>   - Test in UDP mode also.   TCP is extremely sensitive to loss.
>     iperf/TCP measures how well you can do TCP which is what you usually
>     care about, and if it's close to line rate (even 350/1000), you know
>     all is well.  But if it's slow, you don't know if each packet is
>     slow with little loss, or loss often, or loss above a certain rate,
>     or ?
>
>   - Look at "netstat -i" and error counters, and also do "netstat -s"
>     before and after and diff them, on a system with nothing else
>     happening (maybe even single user).  Anything that changes that you
>     don't expect is interesting and I've found a lot of issues this way.
>
>   - Run tcpdump and save to a file, and use tcpdump2xplot from
>     graphics/xplot-devel to visualize it, after patching up the perl
>     program or editing the trace to make it look like tcpdump used to
>     look.  This is a lot of effort, and requires you to not only learn
>     to deal with that software, but to really understand TCP.  But it
>     can be very illuminating as to what is going on.
>
>     You can also select one stream and just examine the text output.

Thank you for these suggestions. I'll keep them in mind for when I have extended time to explore.

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  matthewd%fastmail.us@localhost