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[asbokid]

Hi Les-70,

When using ADSL2+, I didn't really notice much if any performance gain between the BLOBs.  However, the gain is more apparent with VDSL2.  It's not a massive amount -  a couple of extra megabits in the downstream, and a proportionate amount in the upstream.

That's strange that Chrome doesn't work.  I diffed the two root file systems (the original one and the one modified with a new blob) and the blob is the only difference.  Unless the wrong image was uploaded?!  Did you flash the image with md5sum b44ffc3a98eae8e264a7540982fb1114?   That was the image I diffed as correct.

Could it be cookie-related?  All the Huawei home gateways rely on the same cookies. Swapping out these devices seems to confuse a browser.  In what way does Chrome not work properly?   It would be easier for me to illustrate with screenshots, but are there blank fields on the Device Info page?  If so, that is the cookie issue.

cheers, a

[les-70]

Hi,

 The initial log page is fine, after that I just get one page as below.  It is the same on a laptop, both worked with original image. I have tried deleting all cookies for the modem IP.  I used the image from 

https://docs.google.com/folder/d/0B6wW18mYskvBNWZLWVNXWmUtME0/edit?pli=1

 which looks correct.  I had noticed that you got no effect with asdl2 in your dynamic blob swap test but wondered on annex m. Which as noted works now. 

 Les

[asbokid]

Strange that it should only affect Chrome.  Sorry. No idea!

cheers, a

[les-70]

  I think you were correct  re cookies or at least something related.   I tried a Puppy Linux Chrome and that was fine so I went back to XP but it still did not work after the reboot.  Then I did a full clear of all browsing data other than passwords and closed and opened chrome.  It worked then!!!   It seemed to need more than the modem IP's cookies being deleted.

[asbokid]

Aha!  I thought it might be something like that!   That got me flummoxed for ages. When we first started re-flashing firmware for the HG612 they all seemed corrupted!   It was only by chance from using the "Private Browsing" tool of Firefox that it became clear that the firmware was actually okay and it was the browser.  Presumably the "Incognito" tool of Chrome works similarly.  IIRC, deleting x hours of browsing history has the same effect in Firefox.  More than just cookies.  Wonder what it is?  Browser cache?  Glad you got it sorted.

cheers, a

[pettaw]

I've just upgraded to the new BLOB and have noticed a 4meg increase in sync speed on my FTTC line, from 66M to 70M, upload is limited to 20M. I also have the advantage of being in the Samknows Whitebox programme so I'll see if speeds take a corresponding upward change too in the next few days.

[asbokid]

Great news, Pettaw!   Please keep us informed!

Cheers, a

[zhadoom]

Hi,

After making some tests this new blob show consistent better SNR in my connection.
My provider limits down/up based on a profile. In my case 38/4 Mb/s.

A very curious effect shows using telnet and enabling SRA on the connection. The SNR of downstream increases about 6dB. I don't change the training margin.

Code: [Select]

xdslcmd stop
xdslcmd start --up --sra on

The connection looks stable and I have no trouble with SRA on. I'm testing over the last 2 days.

The big questions:
- what SRA does to change the SNR ? or is just a bug in firmware that shows altered values ?
- If is worth how can this setting be saved in modem config ?

[biohead]

I've reverted back to using a HG612, using this new blob.

As some of you may remember, I was able to determine that when I previously switched to a HG612 from my ECI, DLM was applied to my line after a duration of time in the form of interleaving being applied and a reduction in sync speed.

Although I'm still not quite able to get 24/7 logging, I'm able to go and plug my laptop into the modem occasionally and keep an eye on what's happening.

[Bald_Eagle1]

Here are the differences between the original BLOB & the new BLOB on my own VDSL2 connection.

The original BLOB uses all the blue 'Shared/Other' tones & the new BLOB only uses some of them, also moving DS bitloading to slightly higher frequencies.

Switching back to the new BLOB this afternoon has again slightly increased sync speed.

Original BLOB:-

Max:   Upstream rate = 5320 Kbps, Downstream rate = 29896 Kbps
Path:   0, Upstream rate = 5379 Kbps, Downstream rate = 25101 Kbps



New BLOB:-

Max:   Upstream rate = 5443 Kbps, Downstream rate = 30652 Kbps
Path:   0, Upstream rate = 5446 Kbps, Downstream rate = 26381 Kbps

[asbokid]

Thank you, Paul, for running those tests.  They're not the quickest tests to perform, either, what with all the swapping over involved.

Overall, you gained slightly more than a megabit per second in the actual net data rate for the downstream.  Presumably with a better line, supporting potentially fast speeds, the gain would be magnified.   

Useful to see that there is still some advantage though, even on a fairly poor line, if you don't mind me calling it that.

The newer BLOB also supports a new standard G.Inp, for enhanced protection from impulse noise.    G.Inp is defined in ITU-T G.998.4. [1]. Maybe there is something to gain there, too, in terms of stability.

Apparently, G.Inp support is also present in the latest firmware for the Sky router.  [1]  It looks like Sky is already supporting G.Inp in the LLU DSLAMs providing its ADSL2+ service.

cheers, a

[1] http://www.itu.int/rec/T-REC-G.998.4-201006-I
[2] http://helpforum.sky.com/t5/Broadband-Speed/Fastpath-is-enabled-on-my-Sky-connection/td-p/1036404

[Chrysalis]

I was able to flash the quick way but following bald eagle's advice I then flashed again the reset method.

In both cases I seen no noticeable change of sync speed but the error rate has decreased about 25% or so.

[biohead]

Just an update from my side - I've been running the HG for about 20 days or so now, sync speed is still as high as the ECI (76500k) and no interleaving has been applied either - a far cry from the last time I ran the HG modem!

[pettaw]

OK I've had the new blob installed for just about a month now, and tbh, although sync speed is still higher than it was before, its dropped a bit and is currently at about 68M. I still get the resyncs approximately every 3 days due to intermittent noise spikes. Whether that's REIN, or crosstalk or whatever. I did complain to BT, but they said that as my sync speeds were good, its perfectly acceptable to have resyncs every 3 days....well fine. Luckily I have no INP or Interleaving applied so DLM obviously is happy too. Anyway..

Samknows throughput testing hasn't really shown any difference whatsoever. Approximately 62M throughput which has remained fairly steady throughout.

I'm still glad I flashed it though.

Hope that helps.