netdev - Re: [PATCH net] tcp: only postpone PROBE_RTT if RTT is < current min

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Message-Id: <160564020504.18685.6007226279853595659.git-patchwork-notify@kernel.org>
Date:   Tue, 17 Nov 2020 19:10:05 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Ryan Sharpelletti <sharpelletti.kdev@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        sharpelletti@...gle.com, ncardwell@...gle.com, soheil@...gle.com,
        ycheng@...gle.com
Subject: Re: [PATCH net] tcp: only postpone PROBE_RTT if RTT is < current min_rtt
 estimate

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Mon, 16 Nov 2020 17:44:13 +0000 you wrote:
> From: Ryan Sharpelletti <sharpelletti@...gle.com>
> 
> During loss recovery, retransmitted packets are forced to use TCP
> timestamps to calculate the RTT samples, which have a millisecond
> granularity. BBR is designed using a microsecond granularity. As a
> result, multiple RTT samples could be truncated to the same RTT value
> during loss recovery. This is problematic, as BBR will not enter
> PROBE_RTT if the RTT sample is <= the current min_rtt sample, meaning
> that if there are persistent losses, PROBE_RTT will constantly be
> pushed off and potentially never re-entered. This patch makes sure
> that BBR enters PROBE_RTT by checking if RTT sample is < the current
> min_rtt sample, rather than <=.
> 
> [...]

Here is the summary with links:
  - [net] tcp: only postpone PROBE_RTT if RTT is < current min_rtt estimate
    https://git.kernel.org/netdev/net/c/1b9e2a8c99a5

You are awesome, thank you!
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