Hi Hannes, "Optimization" tries to empty all links on one line-card with priority, then this line card can be shut off to save the high baseline power.
Thanks, Mingui Zhang Huawei Technologies >-----Original Message----- >From: [email protected] [mailto:[email protected]] On Behalf Of >Hannes Gredler >Sent: Friday, February 08, 2013 4:25 PM >To: Tony Li >Cc: Shankar Raman M J; [email protected] >Subject: Re: Power aware networks : Comments requested from routing >community > >tony, > >agree that saving power is a worthwhile goal; > >in fact existing hardware technology is making that happen today by >e.g. automatically shutting down unused lookup engines, CPU cores, memory >banks etc. >when there is low processing demand. > >the part where i am not yet convinced is that additional off-peak >"optimization" >of >infrastructure links by e.g. computing a routing mesh which only uses >70% of the nominal links does actually give much power savings. > >note that line cards which are running at 70% have already throttled down their >power consumption - so what is the point emptying the link and loading >another ? >appears to me a zero sum game. > >my concern about the core (and SP edge) is not about business or technology - >it is more about if we try to optimize an already optimized (and solved) >problem. > >/hannes > >On Feb 7, 2013, at 5:09 PM, Tony Li wrote: > >> >> On Feb 7, 2013, at 5:07 AM, Hannes Gredler <[email protected]> wrote: >> >>> Do you think that optimizing a part of the network which gives only limited >>> overall savings is a worthwhile goal ? >> >> >> Hannes, >> >> I'll just point out that this argument that you and Eric are espousing is >> skirting >dangerously close to the quagmire of business. And we know from long >experience that the IETF does not do business models. >> >> I'd like to strongly suggest that we simply restrict ourselves to the goal of >saving power. I think that we can agree, in general, that saving power is a >worthwhile goal. As to whether or not it is significant or makes economic >sense is very much an issue that should be left to the operator community to >decide. Limited overall savings may be worthwhile in one context and pointless >in another. >> >> I know of one country where they are purportedly mandating power reductions. >In such situations, saving that last watt is the difference between a fine and >not. >On the other hand, in a situation where power is very cheap, it's obviously >silly. >> >> Let's not argue about the marginal value of energy. That's a business model >issue. Let's talk about how technology can actually save power. >> >> Regards, >> Tony >> >> > > >_______________________________________________ >rtgwg mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/rtgwg _______________________________________________ rtgwg mailing list [email protected] https://www.ietf.org/mailman/listinfo/rtgwg
