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Date: Mon, 24 Oct 2022 18:20:18 +0000 From: patchwork-bot+netdevbpf@...nel.org To: Neal Cardwell <ncardwell.kernel@...il.com> Cc: kuba@...nel.org, edumazet@...gle.com, davem@...emloft.net, netdev@...r.kernel.org, ncardwell@...gle.com, ntspring@...com, ycheng@...gle.com Subject: Re: [PATCH net] tcp: fix indefinite deferral of RTO with SACK reneging Hello: This patch was applied to netdev/net.git (master) by Jakub Kicinski <kuba@...nel.org>: On Fri, 21 Oct 2022 17:08:21 +0000 you wrote: > From: Neal Cardwell <ncardwell@...gle.com> > > This commit fixes a bug that can cause a TCP data sender to repeatedly > defer RTOs when encountering SACK reneging. > > The bug is that when we're in fast recovery in a scenario with SACK > reneging, every time we get an ACK we call tcp_check_sack_reneging() > and it can note the apparent SACK reneging and rearm the RTO timer for > srtt/2 into the future. In some SACK reneging scenarios that can > happen repeatedly until the receive window fills up, at which point > the sender can't send any more, the ACKs stop arriving, and the RTO > fires at srtt/2 after the last ACK. But that can take far too long > (O(10 secs)), since the connection is stuck in fast recovery with a > low cwnd that cannot grow beyond ssthresh, even if more bandwidth is > available. > > [...] Here is the summary with links: - [net] tcp: fix indefinite deferral of RTO with SACK reneging https://git.kernel.org/netdev/net/c/3d2af9cce313 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
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