bbr v3 behavior on wired network on upload.
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muhamm...@umt.edu.pk
Mar 27, 2025, 11:52:11 PMMar 27
to bbr...@googlegroups.com, Neal Cardwell
Hi guys,
I have installed bbr v3 on my linux (6.13.7) based ubuntu machine and today I tested it by sending a single TCP stream in Upload test. The network is wired 100 Mbps to the “linux 6.11.0-19 generic” server running netperf server.
Below is the output I am getting. I repeated the tests but same results. BBR v3 upload is shown via green graph and it drops after regular intervals, any idea why it is doing so
?
The result with Cubic as congestion control is below: the cubic stream is going smooth in UPLOAD test without any periodic drops.
Regards,
Ahsan
Bless, Roland (TM)
Mar 28, 2025, 3:47:54 AMMar 28
to muhamm...@umt.edu.pk, bbr...@googlegroups.com, Neal Cardwell
Hi,
yes, it's a core feature of BBR to measure the RTT without queuing
delay. Every 5s, a BBRv3 flow goes into ProbeRTT and reduces its
amount of inflight data to 0.5 of the estimated BDP. This
typically lasts only 200ms.
Regards,
Roland
On 28.03.25 at 04:51 muhamm...@umt.edu.pk wrote:
> Hi guys,
>
> I have installed bbr v3 on my linux (6.13.7) based ubuntu machine and
> today I tested it by sending a single TCP stream in Upload test. The
> network is wired 100 Mbps to the “linux 6.11.0-19 generic” server
> running netperf server.
>
> Below is the output I am getting. I repeated the tests but same
> results. BBR v3 upload is shown via green graph and it drops after
> regular intervals, any idea why it is doing so
>
> ?
>
>
> Ahsan
>
> --
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> dev/000901db9f94%24c38e4a20%244aaade60%24%40umt.edu.pk <https://
> groups.google.com/d/msgid/bbr-
> dev/000901db9f94%24c38e4a20%244aaade60%24%40umt.edu.pk?
> utm_medium=email&utm_source=footer>.
yes, it's a core feature of BBR to measure the RTT without queuing
delay. Every 5s, a BBRv3 flow goes into ProbeRTT and reduces its
amount of inflight data to 0.5 of the estimated BDP. This
typically lasts only 200ms.
Regards,
Roland
On 28.03.25 at 04:51 muhamm...@umt.edu.pk wrote:
> Hi guys,
>
> I have installed bbr v3 on my linux (6.13.7) based ubuntu machine and
> today I tested it by sending a single TCP stream in Upload test. The
> network is wired 100 Mbps to the “linux 6.11.0-19 generic” server
> running netperf server.
>
> Below is the output I am getting. I repeated the tests but same
> results. BBR v3 upload is shown via green graph and it drops after
> regular intervals, any idea why it is doing so
>
> ?
>
> The result with Cubic as congestion control is below: the cubic stream
> is going smooth in UPLOAD test without any periodic drops.
>
> Regards,
> is going smooth in UPLOAD test without any periodic drops.
>
>
> Ahsan
>
> --
> You received this message because you are subscribed to the Google
> Groups "BBR Development" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to bbr-dev+u...@googlegroups.com <mailto:bbr-
> dev+uns...@googlegroups.com>.
> To view this discussion visit https://groups.google.com/d/msgid/bbr-
> dev/000901db9f94%24c38e4a20%244aaade60%24%40umt.edu.pk <https://
> groups.google.com/d/msgid/bbr-
> dev/000901db9f94%24c38e4a20%244aaade60%24%40umt.edu.pk?
> utm_medium=email&utm_source=footer>.
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