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

[Dave Temkin]

600 Mbit port-to-port on a 6148 is probably pushing it a little,
especially if there is other significant traffic on the 6148's to begin
with...

Those cards weren't designed for that kind of traffic.

-Dave


On Mon, 15 May 2006, Alex wrote:

> 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
>
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > 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>
> > -----BEGIN PGP SIGNATURE-----
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> > =pgt8
> > -----END PGP SIGNATURE-----
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