[altq 75] Re: When a class is delayed (undertime)

[Fulvio Risso <F.Risso@cs.ucl.ac.uk>]

Hello Kenjiro.
Good point.

But... I'm always confused.
Does it make sense using ifnow_ to compute the agvide, and nowp to compute the suspension time?
By the way, nowp does not include the pkt_time. Shoud this value be added to tidle?

Thanks,

	fulvio

> -----Original Message-----
> From: owner-altq@csl.sony.co.jp [mailto:owner-altq@csl.sony.co.jp]On
> Behalf Of Kenjiro Cho
> Sent: Thursday, August 05, 1999 5:49 AM
> To: altq@csl.sony.co.jp
> Subject: [altq 73] Re: When a class is delayed (undertime)
> 
> 
> 
> Fulvio Risso said:
> >> Could you please explain why do you inserded the following code?
> >> +	tidle =3D (1 - RM_POWER) * avgidle >> RM_FILTER_GAIN;
> >> +	TV_ADD_DELTA(nowp, tidle, &cl->undertime_);
> 
> >> Why are you adding (1 - RM_POWER) * avgidle >> RM_FILTER_GAIN ?
> >> What does it means this value?
> 
> >> In this way, the suspension time becomes:
> >> susp_time = nowp + tidle + packet_time + offtime
> 
> susp_time = now + tidle + offtime
> 
> At this point, avgidle is negative.
> The target idle time (tidle) is required to bring avgidle back to 0.
> (tidle is supposed to be small when the class is not allowed to borrow.)
> To make the class able to send minburst packets at the resume time,
> offtime needs to be added to the suspention time.
> 
> -Kenjiro