netdev - Re: [PATCH v2] tcp: cwnd does not increase in TCP YeAH

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Date:   Thu, 08 Sep 2016 17:16:42 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     agermanov@...horfree.com
Cc:     netdev@...r.kernel.org, nanditad@...gle.com, edumazet@...gle.com,
        ncardwell@...gle.com, ycheng@...gle.com, d.adamushko@...horfree.com
Subject: Re: [PATCH v2] tcp: cwnd does not increase in TCP YeAH

From: Artem Germanov <agermanov@...horfree.com>
Date: Wed, 7 Sep 2016 10:49:36 -0700

> Commit 76174004a0f19785a328f40388e87e982bbf69b9
> (tcp: do not slow start when cwnd equals ssthresh )
> introduced regression in TCP YeAH. Using 100ms delay 1% loss virtual 
> ethernet link kernel 4.2 shows bandwidth ~500KB/s for single TCP 
> connection and kernel 4.3 and above (including 4.8-rc4) shows bandwidth 
> ~100KB/s.
>    That is caused by stalled cwnd when cwnd equals ssthresh. This patch 
> fixes it by proper increasing cwnd in this case.
> 
> Signed-off-by: Artem Germanov <agermanov@...horfree.com>
> Acked-by: Dmitry Adamushko <d.adamushko@...horfree.com>

Applied and queued up for -stable, thanks.