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Author Topic: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)  (Read 88144 times)

luggles

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #135 on: May 24, 2018, 01:38:09 AM »

Yes, the VMG8924 and VMG8324 share the same firmware.

And while I think of it: "Welcome to the Kitz forum.:)

Thanks for the clarification and the warm welcome.
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #136 on: May 24, 2018, 03:14:40 AM »

I have dug up a set of release notes for the low-level broadcom driver in the web somewhere. In the bug fixes I saw, I don’t remember noticing anything relating to lowly G.992.3. Is that correct? I didn't know how far back to look as I was not sure what the baseline low-level driver version was.
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #137 on: May 24, 2018, 04:27:40 AM »

I have dug up a set of release notes for the low-level broadcom driver in the web somewhere. In the bug fixes I saw, I don’t remember noticing anything relating to lowly G.992.3. Is that correct? I didn't know how far back to look as I was not sure what the baseline low-level driver version was.

I found this from cisco detailing the changes from 39v to 39x1:

https://www.cisco.com/web/software/282821780/140978/ReleaseNote_A2pv6F039x3.pdf

Only these lines mention G992.x
Quote
Improve kl0 estimate in G.992.[35]
Fix long training time in G.992.1 against AD72 DSLAM

I'm not sure what these even mean so  ???

If you see no improvement with the 39x1 driver its probably best to stick with the one zyxel chose to use. I was interested it trying the later driver as I have experienced some weird behaviour with my line and recent firmwares and have G.vector (G.993.5) and there are several mentions to improvement with it. There may be unforeseen consequences to just swapping out the adsl_phy.bin without changing the kernel driver as again from the cisco document:
Quote
Improve power saving in DSL PHY by powering down unused line. This feature requires
new xDSL driver A2x026n


With 26n I believe referring to a later kernel driver to the 26a one these zyxel firmware have. So be warned its experimental and probably not advised, but hey, if people dont see and stability issues and see some kind of improvement then why not.
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #138 on: May 24, 2018, 04:46:54 AM »

Is there a .bin file editor I can use just 'for curiosity' ?

You can use binwalk on linux to unpack the filesystem to poke around, its what I used to get the xDSL bin out the 3925 firmware:
https://github.com/ReFirmLabs/binwalk

If setting up VMs isnt a hassle you can create these firmwares yourself with no trust in a 3rd party other than xyxel. They have a GPL request page where you put in your model and serial number and they supply a package with all the tools and easy to use scripts to create the firmware, there are only 2 changes you need to make to get jumbo frames working and they are detailed in Olipro's repo mentioned earlier in the thread. The instructions in the package are clear and easy to follow. As it says in them and Olipro's github you have to build on an old 32bit version of ubuntu, but the only thing that makes it any harder to use than a normal system is changing the apt sources to point at ubuntu's old archives.
 
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #139 on: May 24, 2018, 04:48:54 AM »

Could that be read two ways? - 1 needing a later higher level driver if one wishes to make use of eg a new power management feature, as opposed to 2. interface compatibility / incompatibility between lower and upper level drivers
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #140 on: May 24, 2018, 04:51:40 AM »

Should we transfer to the other thread concerned with software ‘maintenance’? What do you think?
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #141 on: May 24, 2018, 04:55:25 AM »

I read it as the former, the fact it mentions you needed the newer kernel driver for only that feature suggests you can use old ones and simply not have it. But who knows, I thought I'd still say something as 26a vs 26n sounds like a lot of iterations missed in the zyxel supplied one.
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #142 on: May 24, 2018, 07:08:21 AM »

Ah I see.
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #143 on: May 25, 2018, 03:27:31 PM »

Any gains so far over the older dsl driver?
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #144 on: May 25, 2018, 05:00:01 PM »

No. Just very slightly worse downstream sync rate.
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underzone

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #145 on: May 25, 2018, 05:42:48 PM »

Mine was up slightly with the new firmware, same error rates for me as the latest standard Zyxel firmware.

ES/hour:                   1.49   (down)   0.09 (up)
« Last Edit: May 26, 2018, 11:26:06 AM by underzone »
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #146 on: May 26, 2018, 02:31:33 AM »

Yes I didn't note error rates.
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hushcoden

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #147 on: May 26, 2018, 07:47:02 PM »

May I ask someone who is using the MTU=1508 whether you can really get better performance or what's the benefit(s) ?

Tia.
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #148 on: May 27, 2018, 04:35:50 PM »

It is purely theoretical in my view, no possibility of any problems with the reduced IP MTU 1492 packet size with applications that send IP 1500 byte packets. There is a very slight performance increase though due to the extra 8 bytes of payload being carried in an IP packet or TCP+IP packet, 1500/1492
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j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #149 on: May 27, 2018, 06:48:23 PM »

May I ask someone who is using the MTU=1508 whether you can really get better performance or what's the benefit(s) ?

Tia.

Packet sizes can be 0.005% bigger.
Not something you're going to notice in real time.
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