[Ronja] packetloss nad 1500B

Karel Kulhavy clock at twibright.com
Tue Apr 19 19:05:42 BST 2005


On Sun, Mar 27, 2005 at 12:45:40PM +0200, Martin Kucko wrote:
> At 10:09 25.3.2005 +0000, you wrote:
> >On Wed, Mar 23, 2005 at 02:57:47PM +0100, Martin Kucko wrote:
> >> At 12:03 23.3.2005 +0100, you wrote:
> >>
> >> >> At 19:37 20.3.2005 +0000, you wrote:
> >> >>
> >> >> >> >at 1500 bytes of Ethernet frame payload. It can be problem of the
> >> >> >> >endpoints - I think I have observed this behaviour by Linux as 
> >well
> >> >but
> >> >> >> >am not sure.
> >> >> >> >
> >> >> >> >Please connect a plain wire (Cat4-5e crossover STP/UTP cable or 
> >what
> >> >> >> >fits into your situation) instead of Ronja and try again. If you
> >> >get the
> >> >> >> >packetloss as well, then it's a problem of the operating systems 
> >or
> >> >too
> >> >> >> >low-end-designed network cards that easily get overrun by 
> >receiving
> >> >> >> >multiple frames at a time.
> >> >> >> >
> >> >> >> >CL<
> >> >> >>
> >> >> >> Do you mean that  problem can be in cable? It is realy possible. I
> >> >will
> >> >> >> change the wire.
> >> >> >
> >> >> >Which cable?
> >> >>
> >> >> UTP cable in twister.
> >> >
> >> >No I don't mean this. I mean put Ronja completely aside and try with a
> >> >piece of wire instead of Ronja to determine if the problem is in Ronja
> >> >or in rest of the system.
> >> >
> >> >CL<
> >>
> >> I did it at first. I used AUI cable + AUI<->UTP transceiver + UTP cable 
> >and
> >> all worked good.
> >
> >This looks interesting. That should not probably happen unless Ronja design
> >is buggy or your device is built wrong.
> >
> >Please don't delete the line with original description of problem. Please
> >describe it again.
> >
> >If the problem was with full duplex, did you test the wire-only setup in 
> >full
> >duplex too?
> >
> >Are there any deviations from Ronja guide?
> >
> >Can you provide photos of electronics insides of your Ronja and overall 
> >photo
> >of your Ronja testing setup?
> >
> >CL<
> 
> 
> Problem isn't in FD setting. Just NIC can't work FD that's all. Today's 
> night I disconnect switch (and disconnect all PCs connected via switch). 
> And connect twister into the PC NIC. Packet over 1500 works with 0% 
> packetloss. Problem is, twister can't works good, when it's connected to 
> the switch. I think that problem can be only with small percent of 
> switches. This switch is infosmart.

Maybe the switch has problems with two packets coming directly
one after another. Or maybe with the dreaded auto MDI/X.

This looks like Twister is good.

CL<




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