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Date:   Wed, 13 Jun 2018 10:48:05 -0700
From:   Eric Dumazet <>
To:     Yuchung Cheng <>,
        Michal Kubecek <>
Cc:     netdev <>,
        Eric Dumazet <>,
        Ilpo Jarvinen <>,
Subject: Re: [RFC PATCH RESEND] tcp: avoid F-RTO if SACK and timestamps are

On 06/13/2018 10:32 AM, Yuchung Cheng wrote:
> On Wed, Jun 13, 2018 at 9:55 AM, Michal Kubecek <> wrote:
>> When F-RTO algorithm (RFC 5682) is used on connection without both SACK and
>> timestamps (either because of (mis)configuration or because the other
>> endpoint does not advertise them), specific pattern loss can make RTO grow
>> exponentially until the sender is only able to send one packet per two
>> minutes (TCP_RTO_MAX).

>> Signed-off-by: Michal Kubecek <>
> Acked-by: Yuchung Cheng <>
> Thanks for the patch (and packedrill test)! 

Yes, thanks a lot Michal.

Signed-off-by: Eric Dumazet <>

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