[c-nsp] Packet reordering and flow-control on 6509

[Alex]

How do You measure reordering? Is packet generator being used? If yes then 
it might be just a
sequence numbering issue at packet gen rather than actual reordering.
Basically, packet gen default config is to number packets per-port rather 
than per-flow.
HTH
Cheers
Alex

----- Original Message ----- 
From: "Christopher J. Pilkington" <cjp at 0x1.net>
To: <cisco-nsp at puck.nether.net>
Sent: Wednesday, May 10, 2006 5:54 PM
Subject: [c-nsp] Packet reordering and flow-control on 6509


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> We're seeing a significant amount of reordering on a 6509
> with a Sup1A running 7.6(5) box with traffic between hosts
> on different WS-6148-GE-TXes.  This is all layer 2, no MSFC is
> involved.
>
> The customer claims their application is sensitive to
> reordering, and they claim to see over 40% of packets reordered,
> yet still seeing >600Mb/s throughput.
>
> We have noticed that the 6509 is sending TxPauses quite a bit,
> which concerns us.  This suggests to me that we are overrunning
> buffers, true?  But would this cause reordering?  Perhaps from
> retransmits?
>
> Anyone have any input/advice/suggestions of what to look at?
>
> - -- 
> Christopher J. Pilkington <cjp at 0x1.net>
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