[c-nsp] Information on rate limit issue

[Paul Schopis]

Siva,
What I am referring to is a hardware limitation on the switch that does not allow one to set a proper burst size for above a certain rate-limit threshold. Off the top of my head it was ~30 Mbps. So anything below that is probably OK. There is a brief description at http://www.velocityreviews.com/forums/t30721-rate-limiting-with-3550-and-3750-troubles.html.

I am only trying to get the specifics. In this write up one of the folks on the thread states that the 3750 has a 1 MB total burst capability which translates into a 15 Mbps TCP stream that could be supported. 

Thanks,
Paul


>>> On Wed, Jun 13, 2007 at  1:54 PM, in message
<Pine.GSO.4.64.0706131050400.25933 at sj-cse-591.cisco.com>, Siva Valliappan
<svalliap at cisco.com> wrote: 
> the C3750 is capable of wire rate forwarding so there should be no TCP
> performance issue with vanilla forwarding.  if you are having issues when
> rate limiting is enabled it could be due to any number of reasons (e.g.
> it is behaving as per configuration :) )
> 
> some more detail might help someone on the list answer your question.
> such as topology, configuration, traffic pattern, etc.
> 
> cheers
> .siva
> 
> On Tue, 12 Jun 2007, Paul Schopis wrote:
> 
>> I am needing to find a concise description of an issue on the Cisco 3550 or 
> 3750. As I understand it there is an issue with getting good TCP performance 
> due to a hardware limitation (Broadcom Chipset?) that will not allow one to 
> properly set the burst size. I would like to understand this issue better and 
> seem to be having difficulty finding a good description of the issue.
>>
>> Thanks in advance,
>> Paul
>>
>>
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