[alcatel-nsp] What is the default value of MBS on access queues?

[Kila Hsu]

Thanks a lot for all prompt answers.. If it means by default any traffic going through a SAP with default MBS setting will not exceed 10ms of queueing time, I'm not that care about how much buffer size is allocated... 

Now there's another question.. Does the "default algorithm" take care of the bandwidth "allocated to" (instead of "PIR configured for") each queue, especially when the queue has parent schedulers that have their own PIRs, so each queue, once filled, will have a roughly 10ms delay?

Any thoughts would be appreciated.

Regards,
Kila Hsu


--- On Wed, 7/28/10, Garcia Del Rio, Diego (Diego) <diego.garcia_del_rio at alcatel-lucent.com> wrote:

> From: Garcia Del Rio, Diego (Diego) <diego.garcia_del_rio at alcatel-lucent.com>
> Subject: Re: [alcatel-nsp] What is the default value of MBS on access queues?
> To: "'rhuey at anzus.com'" <rhuey at anzus.com>, "'hsukila at yahoo.com'" <hsukila at yahoo.com>
> Cc: "'alcatel-nsp at puck.nether.net'" <alcatel-nsp at puck.nether.net>
> Date: Wednesday, July 28, 2010, 8:24 PM
> Sorry, to avoid any confusion i
> wanted to clarify. The default mbs is indeed 10msecs (with a
> certain rounding "noise"). What i meant with my explanation
> is that the available total buffer spave depends on the
> factors previously mentioned. 
> 
> Cheers
> 
> Diego Garcia del Rio
> Product Management, IPD
> Mountain View,CA
> +1 (415) 439-9420
> 
> 
> ----- Original Message -----
> From: alcatel-nsp-bounces at puck.nether.net
> <alcatel-nsp-bounces at puck.nether.net>
> To: 'rhuey at anzus.com'
> <rhuey at anzus.com>;
> 'hsukila at yahoo.com'
> <hsukila at yahoo.com>
> Cc: 'alcatel-nsp at puck.nether.net'
> <alcatel-nsp at puck.nether.net>
> Sent: Thu Jul 29 00:56:08 2010
> Subject: Re: [alcatel-nsp] What is the default value of MBS
> on access queues?
> 
> The buffer size allocated will depend on the number of
> ports in the mda as well as the number of access vs network
> ports as well as the speed of the port and the rate of the
> queue configured. In short, its quite conplicated. ;)
> 
> Cheers!
> 
> Diego Garcia del Rio
> Product Management, IPD
> Mountain View,CA
> +1 (415) 439-9420
> 
> 
> ----- Original Message -----
> From: alcatel-nsp-bounces at puck.nether.net
> <alcatel-nsp-bounces at puck.nether.net>
> To: Kila Hsu <hsukila at yahoo.com>
> Cc: alcatel-nsp at puck.nether.net
> <alcatel-nsp at puck.nether.net>
> Sent: Thu Jul 29 00:37:39 2010
> Subject: Re: [alcatel-nsp] What is the default value of MBS
> on access queues?
> 
> 
> show pools slot/mda[/port] access-ingress
> 
> Example:   Here's a simple NULL encap
> (2/1/10) ePipe assigned to service-id 73 with no (read:
> default) ingress/egress queues assigned.
>   
> 
> *A:ESS-12# show pools 2/1/10 access-ingress 
> 
> ===============================================================================
> Pool Information
> ===============================================================================
> Port             
>    : 2/1/10         
>                
>                
>         
> Application          :
> Acc-Ing           Pool
> Name          : default 
>         
> Resv CBS         
>    : Sum         
>                
>                
>            
> -------------------------------------------------------------------------------
> Utilization             
>      State   
>    Start-Avg    Max-Avg 
>   Max-Prob
> -------------------------------------------------------------------------------
> High-Slope             
>       Down         
>     70%        90% 
>        80%
> Low-Slope             
>        Down     
>         50%       
> 75%         80%
>  
> Time Avg Factor      : 7     
>                
>                
>              
>    
> Pool Total           :
> 12288 KB             
>                
>                
>   
> Pool Shared          : 8192
> KB           Pool
> Resv          : 4096 KB 
>         
>  
> Pool Total In Use    : 0 KB     
>                
>                
>               
> Pool Shared In Use   : 0 KB   
>           Pool Resv In
> Use   : 0 KB       
>      
> WA Shared In Use     : 0 KB 
>                
>                
>                
>   
>  
> Hi-Slope Drop Prob   : 0     
>            Lo-Slope Drop
> Prob : 0             
>   
> -------------------------------------------------------------------------------
> Name               
>           FC-Maps   
>    MBS       HP-Only
> A.PIR    A.CIR
>                
>                
>             CBS   
>    Depth   O.PIR   
> O.CIR
> -------------------------------------------------------------------------------
> 73->2/1/10->1
>                
>               be l2 af
> l1   1280      256 
>    1000000  0   
>    
>                
>               h2 ef h1
> nc   0     
>    0       Max 
>     0       
> ===============================================================================
> 
> 
> I hope this helps. 
> 
> rgds,
>     --r 
>  
> 
> 
> On Jul 28, 2010, at 3:00 PM, Kila Hsu wrote:
> 
> > Hi All,
> > 
> > Anyone have an idea what might be the default value of
> MBS/CBS on queues that are configured on SAP ingress/egress
> QoS policy?
> >> From the configuration guides, the default value
> is "default", which does not quite answer the question...
> > Would it be something that is MDA-specific, or some
> hard-coded value?
> > 
> > Thanks a lot for any answer.
> > Kila Hsu
> > 
> > 
> > 
> > _______________________________________________
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> > alcatel-nsp at puck.nether.net
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> 
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