| reply to Guspaz
Re: Question about 100MB business fiber I was thinking the same thing given profiles are set higher than the 25/7. We typically set the MRU/MTU to 1480 but perhaps dropping the MRU to 1460 would optimize this connection. |
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 GuspazGuspazPremium,MVM
join:2001-11-05
Montreal, QC
kudos:20 | Actually, now that I think about it, VDSL2 doesn't use ATM, so the rules about optimal MRUs aren't the same as they were for ADSL... Back in the day, you had to set it correctly to avoid wasting ATM cells, like if your pppoe frame was just one byte over the limit, it would require an entire extra ATM cell... But that's not the case anymore, so my comments may not apply.
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Developer: Tomato/MLPPP, Linux/MLPPP, etc »fixppp.org |
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| reply to Guspaz
Thanks for updating Guspaz. Your input is always appreciated. I'm not sure what could be causing the bottleneck if there is one. I'll do a bit of research and try to figure out what it could be I suppose.
Paulo |
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GuspazGuspazPremium,MVM
join:2001-11-05
Montreal, QC
kudos:20 | Basically consider that the sync speed for 25 meg DSL is about 26.95 megs, so your customer is actually seeing 89 meg throughput on a ~108 meg aggregate sync. Overhead on VDSL2 seems to be roughly 6-7% (going from benchmarks here, not doing the math). ATM was one of the biggest sources of overhead with ADSL, and that's gone now, hence the lower overhead. So if he's seeing 89 meg, that's about 17% overhead, way more than we'd expect to see.
Although there is also some MLPPP overhead too, of course, but that was like 0.4%.
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Developer: Tomato/MLPPP, Linux/MLPPP, etc »fixppp.org |
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