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'That VDSL Cat'
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  # 884955 26-Aug-2013 20:15
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well, little early to draw too many conclusions yet, but think i might a bit more headroom to tweak with :D







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  # 885014 26-Aug-2013 22:26
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Whats your normal sync speeds before the tweak.
Just a bit curious thats all.

 
 
 
 


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  # 885015 26-Aug-2013 22:28
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mikenzb: Whats your normal sync speeds before the tweak.
Just a bit curious thats all.


39000 or there abouts.

CRCPM is at 0.01 still few hours later.. graphs are cleaner than before the resync! ill give it a bit more to settle but i might try -60 if im feeling adventurous tomorrow!



considering with the current state of the line it wont get to DLM-1, so may aswell squeeze the 8ms profiles right?  




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  # 885165 27-Aug-2013 10:29
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Inphinity:
hio77:
i still say steam is far worse.. least origins is only doubling or there abouts.. rather than downloading 500TB/s ..


In my experience, steam only reports false speeds for extremely short periods (though of course it remains as the 'peak' speed for the session), and usually only when it's actually rebuilding a partial file from your local cache, or downloading a very small update (for example, one of the games I have recently had a 1.7MB patch, and steam seems to fail to calculate anywhere near right when total download time is <1sec). Origin just blatantly goes "LOL GUYS WE'RE GOIN REAL FAST HERE!" when it isn't, at least for me.


Yes exactly.

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  # 885225 27-Aug-2013 13:23
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looks like error rate has crawled up a tad, but still looking good..







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  # 885234 27-Aug-2013 13:29
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hio77: looks like error rate has crawled up a tad, but still looking good..





That seems like a very high rate of FEC errors to me... I know it's certainly far from the highest posted on here, but nearly 8000 errors per minute? That has to impact on the performance of the line, surely.

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  # 885243 27-Aug-2013 13:34
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Inphinity:
hio77: looks like error rate has crawled up a tad, but still looking good..



That seems like a very high rate of FEC errors to me... I know it's certainly far from the highest posted on here, but nearly 8000 errors per minute? That has to impact on the performance of the line, surely.


my FECs have always been high, comes back to the orignal issue with my line.


Pretty sure... my FECs have been higher.. ill have to go back in files and find it..


only time errors have been noticeable was too high CRC rates (me being someone who notices small jitter pretty heavily..)


ild say the poor fritz just has to strain a little more on thoses FECs..


but yes, i do agree, there surely would be some implication.. maybe ill push them higher and see what breaks? lol




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  # 885251 27-Aug-2013 13:40
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Inphinity:
That seems like a very high rate of FEC errors to me... I know it's certainly far from the highest posted on here, but nearly 8000 errors per minute? That has to impact on the performance of the line, surely.


My understanding is that FEC errors have no impact on performance. FEC errors are errors that have been detected and corrected using the ECC data in the transmitted block so they don't require retransmission of the block. I don't know if DLM takes FEC errors into account though our experience seems to be that it doesn't.

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  # 885256 27-Aug-2013 13:47
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stevehodge:
Inphinity:
That seems like a very high rate of FEC errors to me... I know it's certainly far from the highest posted on here, but nearly 8000 errors per minute? That has to impact on the performance of the line, surely.


My understanding is that FEC errors have no impact on performance. FEC errors are errors that have been detected and corrected using the ECC data in the transmitted block so they don't require retransmission of the block. I don't know if DLM takes FEC errors into account though our experience seems to be that it doesn't.


exactly the way i understand it, ild assume there is a point there where the modem needs to do more calculations than its cpu can handle, and there will be a derogation though. 




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  # 885261 27-Aug-2013 13:54
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hio77:
stevehodge:
My understanding is that FEC errors have no impact on performance. FEC errors are errors that have been detected and corrected using the ECC data in the transmitted block so they don't require retransmission of the block. I don't know if DLM takes FEC errors into account though our experience seems to be that it doesn't.


exactly the way i understand it, ild assume there is a point there where the modem needs to do more calculations than its cpu can handle, and there will be a derogation though. 


Yup, that's the case. And yes, it's the local performance impact of error handling I'm unsure of. I have no idea what the Frtiz' capability is in terms of this. I have seen some routers (admittedly very low spec devices) get to the point where high FEC errors lead to increased CRC errors, as the CPU is under full load trying to correct the errors that packets start being dropped. Perhaps the Ftiz' can tolerate a very hgih number of these errors before it's an issue, though. And no, DLM likely won't take it into account, as the concentrator, in theory, won't see the errors (the local router will just correct the packets before forwarding them). I'd still suspect whatever is causing that many errors, though, to be having some detrimental effect.

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  # 885270 27-Aug-2013 14:03
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Inphinity:
hio77:
stevehodge:
My understanding is that FEC errors have no impact on performance. FEC errors are errors that have been detected and corrected using the ECC data in the transmitted block so they don't require retransmission of the block. I don't know if DLM takes FEC errors into account though our experience seems to be that it doesn't.


exactly the way i understand it, ild assume there is a point there where the modem needs to do more calculations than its cpu can handle, and there will be a derogation though. 


Yup, that's the case. And yes, it's the local performance impact of error handling I'm unsure of. I have no idea what the Frtiz' capability is in terms of this. I have seen some routers (admittedly very low spec devices) get to the point where high FEC errors lead to increased CRC errors, as the CPU is under full load trying to correct the errors that packets start being dropped. Perhaps the Ftiz' can tolerate a very hgih number of these errors before it's an issue, though. And no, DLM likely won't take it into account, as the concentrator, in theory, won't see the errors (the local router will just correct the packets before forwarding them). I'd still suspect whatever is causing that many errors, though, to be having some detrimental effect.


i used to have a nice well respected brand router/modem.. it couldnt handle routing the wireless traffic at all, start streaming files off a SMB share (over wifi), and its cpu would dive to the point where the dsl side would be very heavily affected..

if it ever got that stage, ild be pulling it back pretty dam quick..


unfortunately, i dont have a screen pre the tweak to compare to, but cpu seems to be quite happy still..



i may pull it back for a few days to compare the cpu load.. as a interesting test more than anything..




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  # 885279 27-Aug-2013 14:22
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Inphinity:
hio77:
stevehodge:
My understanding is that FEC errors have no impact on performance. FEC errors are errors that have been detected and corrected using the ECC data in the transmitted block so they don't require retransmission of the block. I don't know if DLM takes FEC errors into account though our experience seems to be that it doesn't.


exactly the way i understand it, ild assume there is a point there where the modem needs to do more calculations than its cpu can handle, and there will be a derogation though. 


Yup, that's the case. And yes, it's the local performance impact of error handling I'm unsure of. I have no idea what the Frtiz' capability is in terms of this. I have seen some routers (admittedly very low spec devices) get to the point where high FEC errors lead to increased CRC errors, as the CPU is under full load trying to correct the errors that packets start being dropped. Perhaps the Ftiz' can tolerate a very hgih number of these errors before it's an issue, though.


Hmm, I assumed the DSL chipset would handle FEC rather than the CPU.

Inphinity:
And no, DLM likely won't take it into account, as the concentrator, in theory, won't see the errors (the local router will just correct the packets before forwarding them). I'd still suspect whatever is causing that many errors, though, to be having some detrimental effect.


It'd see FEC errors on the upstream side though.

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  # 885284 27-Aug-2013 14:32
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OK call me a conspiracy theorist, but last week VDSL got turned on. Chorus did not come to my house (splitter and cable already installed).

Today after 11am Chorus guys knock on the door and says "We're here to install a splitter, does that sound right?". I say very politely that it's not necessary, as I already have one, and VDSL has been enabled since last week.

Now this (as at 2:30, so the current hour is heading the same place):


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  # 885285 27-Aug-2013 14:32
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stevehodge:
Inphinity:
And no, DLM likely won't take it into account, as the concentrator, in theory, won't see the errors (the local router will just correct the packets before forwarding them). I'd still suspect whatever is causing that many errors, though, to be having some detrimental effect.


It'd see FEC errors on the upstream side though.


Actually, it looks like I may have been incorrect there - it seems that (depending on setup/spec/etc) the router may report FEC errors to the DSLAM. 

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  # 885686 28-Aug-2013 08:57
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Maybe I'm just impatient, but despite what Snap have said I don't think they have done the DLM reset. 52 hours since last resync and has had zero CRCs errors but it hasn't resynced to bump me down a level. So still on DLM-8, makes no sense to me.

I've emailed Snap as I think I'd shoot myself in the face if I had to listen to their hold music again.




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