Thanks alot... that fully answered my concern. cheers, Meral
Selon Adrian Farrel <[EMAIL PROTECTED]>: > I think you might predict PCEP communication time as... > > TCP connection setup > PCEP session establishment > PCEP request/response > > You might approximate this with a web browser or any other TCP-based > application. > > FWIW I would expect a simple CSPF to be computed in a few hundred ms at > absolute most (but probably in a less than a few tens of ms) and > communication time to be of the order of one second tops. YMMV. > > Cheers, > Adrian > ----- Original Message ----- > From: "Meral Shirazipour" <[EMAIL PROTECTED]> > To: "Adrian Farrel" <[EMAIL PROTECTED]> > Cc: <[email protected]> > Sent: Tuesday, August 05, 2008 5:44 PM > Subject: Re: [Pce] PCE computation time > > > > Hi Adrian, > > For the PCE computation time, I was considering all that you mentioned > > except > > the compiler efficiency/software implementation dependencies. > > > > Also when you say: > >> In general, > >> for this type of computation, we observe that a remote PCEP communication > >> takes far more time than the computation. (Times may vary according to > >> the > >> pre-existence of the PCEP session.) > > > > are we talking "worse case" PCEP communication time in the order of > > seconds? > > minutes? ..? > > > > I am assuming that: > > PCE response time = PCEP communication time + PCE computation time > > > > Then the total response time is some sort of a summation of the response > > times > > of all the PCEs in the PCE chain. > > > > Any further comments would be greatly apperciated. I am trying to come up > > with > > "typical/realistic" PCE response times for the single LSP computation > > case. I > > do understand that this time could greatly vary depending on the criterias > > you > > mentioned (CPU power, etc.), but just knowing if in practice it is > > typically in > > the orders of seconds, minutes, hours would be of great help to me. > > > > many thanks, > > Meral > > > >> Now then, Meral, > >> > >> I think computation times *might* be dependent on CPU power, loading, > >> compiler efficiency, software implementation, algorithm choice, network > >> complexity, etc. > >> > >> Some observations suggest that computation for single LSPs with normal > >> constraints can be achieved using CSPF and there are studies recording > >> the > >> number of logical steps needed to perform such a computation. In general, > >> for this type of computation, we observe that a remote PCEP communication > >> takes far more time than the computation. (Times may vary according to > >> the > >> pre-existence of the PCEP session.) > >> > >> Other observations note that some computation problems are quite hard and > >> need a few more cycles. In these cases, given the low power of CPUs on > >> NEs, > >> the communication time may be less significant. > >> > >> Cheers, > >> Adrian > >> ----- Original Message ----- > >> From: "Meral Shirazipour" <[EMAIL PROTECTED]> > >> To: <[email protected]> > >> Sent: Tuesday, August 05, 2008 12:24 AM > >> Subject: [Pce] PCE computation time > > > > > >> > Hi, > >> > Does anyone have actual values for the min/average/max PCE > >> > computation > >> > times > >> > in a real network? > >> > I remember that the issue was discussed for the monitoring draft. > >> > > >> > > >> > Thanks, > >> > Meral > >> > > >> > > >> > _______________________________________________ > >> > Pce mailing list > >> > [email protected] > >> > https://www.ietf.org/mailman/listinfo/pce > >> > > >> > >> > >> > > > > > > > _______________________________________________ Pce mailing list [email protected] https://www.ietf.org/mailman/listinfo/pce
