Is BBR enabled on Google Pixel 2 Phone?

[sunil kumar kumar]

Hello, I have couple of questions below..someone kindly reply..:)

 Is BBR Congestion control scheme enabled on Google's Pixel Phone.?

 is this congestion control scheme only has good advantages in Server side only not in Client side?

 Did anyone tested on Mobile devices? All Upload throughput can be improved right ? Like whatsapp video upload, Google Photos upload all upload usecases..

 if this scheme is not enabled on Googles Pixel phone on Mobile device are there any reasons why it is not enabled?

 What is the congestion control scheme enabled on Googles pixel phone? is it CUBIC or some other scheme.

Hope some one replies to my queries.

Best Regards,

Sunil

[Eric Dumazet]

As far as I know, BBR is not yet used on Android devices.

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[Yuchung Cheng]

also AFAIK pixel uses Cubic (Linux default).

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[Neal Cardwell]

Yes, we anticipate that BBR (for TCP and QUIC) should help use cases with mobile senders (and for avoiding buffer bloat and tolerating packet loss in client->server uploads in general, particularly photo/video uploads). But as Eric notes, BBR is not yet enabled on Android devices. Ultimately I would hope to see BBR on Android, but this would take time for testing, roll-out, etc.

cheers,

neal

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[simon....@meraki.net]

One potential problem with mobile (phone/laptop) use of BBR will be WiFi aggregation. To get good utilization in WiFi a high degree of aggregation is essential. Pacing packets, spreading them out in time makes it harder to bunch them back together. It will be important to connect the pacer and the WiFi driver so that packets are delivered in batches appropriately sized for good aggregation numbers. Otherwise a low bottleneck bandwidth down the line will cause high overheads on a WiFi connection. This is kind of similar to TSO.

Simon

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