Autophone - attempt to alleviate network disconnections for Nexus 6P devices

RESOLVED FIXED

Status

Testing
Autophone
RESOLVED FIXED
2 years ago
2 years ago

People

(Reporter: bc, Assigned: marcia)

Tracking

(Blocks: 1 bug)

Trunk
Points:
---

Firefox Tracking Flags

(firefox47 affected)

Details

(Reporter)

Description

2 years ago
We are experiencing frequent network disconnections for the two Nexus 6P devices in Autophone in the Mountain View QA Lab. Looking at the arrangement of the devices, it appears these two devices are on the top shelf next to the Nexus 9 and near the switch at the top of the rack and near the small Belkin usb hub which has several other devices connected to it.

I wonder if re-arranging the devices will help alleviate these network issues.

Possibilities:

1. Move the two Nexus 6P devices away from the Nexus 9 and the switch by putting them on a different shelf.

2. Move the Nexus 9 to a different shelf and to straighten the Nexus 6Ps so they aren't at an angle to each other and their cables are straight.

uber: Do you think you have time to do some experimenting with the arrangement of the Nexus 6Ps?
(Reporter)

Updated

2 years ago
Flags: needinfo?(mbryant)
sure, I'll go ahead and attempt one of the two possibilities based on ease of moving devices around and let you know when I've got it set up and what the new arrangement looks like.

> Possibilities:
> 
> 1. Move the two Nexus 6P devices away from the Nexus 9 and the switch by
> putting them on a different shelf.
> 
> 2. Move the Nexus 9 to a different shelf and to straighten the Nexus 6Ps so
> they aren't at an angle to each other and their cables are straight.
> 
> uber: Do you think you have time to do some experimenting with the
> arrangement of the Nexus 6Ps?
Flags: needinfo?(mbryant)
I moved the Nexus 9 down to the bottom shelf, straightened out the Nexus 6P devices and made sure their USB cables were fully plugged in. Let me know if you observe any differences in the behavior of the devices.
(Reporter)

Comment 3

2 years ago
Thanks. The tree has been closed a lot today, so we'll have to wait for some builds to see if there is any difference.
(Reporter)

Comment 4

2 years ago
Unfortunately, this didn't help.

uber: Can you see if it is possible to move the Nexus 6P devices to a different shelf?

Another possibility is to re-arrange the location of the ateam wireless router, though I am not sure where that is in the lab. Van, do you know where the ateam wireless router is located in the lab?
Flags: needinfo?(vle)
Flags: needinfo?(mbryant)
I moved 6p-2 down a shelf and left 6p-1 on the top shelf. Let me know if that changes how they preform.
Flags: needinfo?(mbryant)
(Reporter)

Comment 6

2 years ago
No improvement in disconnection rate with nexus-6p-1 on the top shelf and the nexus-6p-2 on a lower shelf.

There are reports of issues with Android 6 and wifi disconnections but they are primarily related to the device sleeping. None of our devices should be sleeping while they are connected by the usb cables. Google has mentioned they have fixed the wifi / sleep issue but it is not included in the February update as far as I know. The February update for nexus 6p is supposedly available though I have not seen it on my local devices.

I am at a loss how to improve this situation. The nexus-6p devices sometimes complete the talos tests for a build without disconnection. Other times, they disconnect multiple times per build.

One thought that just occurred to me is that the bad usb card in autophone-1 *might not* be completely dead and *could* be emitting interference. I guess we'll be able to test that scenario when we replace it with a new card.

Comment 7

2 years ago
>Van, do you know where the ateam wireless router is located in the lab?

yes it's mounted to the ceiling in the same room (lab) so the reception should be great barring any interference. we can move the AP up and down a few inches or perhaps back and forth but it's not ideal.
Flags: needinfo?(vle)
(Reporter)

Comment 8

2 years ago
It does not appear that moving the nexus-6p-1 or nexus-6p-2 has resulted in any improvement in the disconnection rate.

The next step with the least intrusive change would be to see if the nexus 6p devices operate better on 2.4 Ghz rather than the 5 Ghz they appear to be using. The nexus 6p has the option to use either 2.4 or 5.0 Ghz. Normally the setting is automatic to allow the device to select the best frequency, but it can be changed via:

Settings->Wifi->3 vertical dots to bring up the small pop up menu->Advanced

Choose Wi-Fi frequency band and select 2.4 Ghz only. To make the selection effective, you can turn Wi-Fi off then back on.

uber, marcia: Could one of you do this for the two nexus-6p devices? In addition, nexus-6p-2 has disconnected. It may need to be unplugged and plugged back into the hub to reconnect. We might as well put the nexus-6ps both back on the same shelf as well since moving them didn't help.
Flags: needinfo?(mozillamarcia.knous)
Flags: needinfo?(mbryant)
(Reporter)

Comment 9

2 years ago
Also, could you check on nexus-s-10? It is connected to autophone-2 and should be on shelf 6.
(Assignee)

Comment 10

2 years ago
(In reply to Bob Clary [:bc:] from comment #9)
> Also, could you check on nexus-s-10? It is connected to autophone-2 and
> should be on shelf 6.

This device was off - I powered it back on.
Flags: needinfo?(mozillamarcia.knous)
(Assignee)

Comment 11

2 years ago
(In reply to Bob Clary [:bc:] from comment #8)
> It does not appear that moving the nexus-6p-1 or nexus-6p-2 has resulted in
> any improvement in the disconnection rate.
> 
> The next step with the least intrusive change would be to see if the nexus
> 6p devices operate better on 2.4 Ghz rather than the 5 Ghz they appear to be
> using. The nexus 6p has the option to use either 2.4 or 5.0 Ghz. Normally
> the setting is automatic to allow the device to select the best frequency,
> but it can be changed via:
> 
> Settings->Wifi->3 vertical dots to bring up the small pop up menu->Advanced
> 
> Choose Wi-Fi frequency band and select 2.4 Ghz only. To make the selection
> effective, you can turn Wi-Fi off then back on.
> 
> uber, marcia: Could one of you do this for the two nexus-6p devices? In
> addition, nexus-6p-2 has disconnected. It may need to be unplugged and
> plugged back into the hub to reconnect. We might as well put the nexus-6ps
> both back on the same shelf as well since moving them didn't help.

I set 6p-2 to 2.4. 6p-1 seems to be crashing any time I touch the wifi sessions. I get a dialog about the bootloader and then the phone reboots.
(Reporter)

Comment 12

2 years ago
Marcia, the nexus-s-10 still doesn't appear. Could you disconnect and reconnect the usb cables for nexus-s-10 (autophone-2/shelf 6) and nexus-6p-2 (autophone-3/shelf ?) ?
Flags: needinfo?(mozillamarcia.knous)
(Reporter)

Comment 13

2 years ago
Marcia reconnected the nexus-s-10 and the nexus-6p-2 and changed the frequency on the nexus 6ps to 2.4 Ghz which appears to have helped. Leaving open for now.
Flags: needinfo?(mozillamarcia.knous)
Flags: needinfo?(mbryant)
(Reporter)

Comment 14

2 years ago
This has resolved the Nexus 6P issues completely from what I can tell. There is a minor issue with the Nexus 6 devices, but I will file a different bug for that.

Thank you to Marcia!
Assignee: nobody → mozillamarcia.knous
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → FIXED
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