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

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Message-ID: <CADVnQy=vPfq2ntggThQ=TZ8MKK5WpXPHMt+L+4FDo5JCD4TejA@mail.gmail.com>
Date:   Mon, 5 Sep 2016 08:52:19 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Artem Germanov <agermanov@...horfree.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Nandita Dukkipati <nanditad@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH] tcp: cwnd does not increase in TCP YeAH

On Mon, Sep 5, 2016 at 12:03 AM, Artem Germanov
<agermanov@...horfree.com> wrote:
>
> 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: Neal Cardwell <ncardwell@...gle.com>

neal