On 06/27/2018 08:04 AM, Eric Dumazet wrote:
>
>
> On 06/26/2018 07:34 PM, Lawrence Brakmo wrote:
>> When using dctcp and doing RPCs, if the last packet of a request is
>> ECN marked as having seen congestion (CE), the sender can decrease its
>> cwnd to 1. As a result, it will only send one packet when a new request
>> is sent. In some instances this results in high tail latencies.
>>
>
>> }
>> /* Force a fast retransmit upon entering fast recovery */
>> sndcnt = max(sndcnt, (tp->prr_out ? 0 : 1));
>> - tp->snd_cwnd = tcp_packets_in_flight(tp) + sndcnt;
>> + tp->snd_cwnd = max((int)tcp_packets_in_flight(tp) + sndcnt, 2);
>
> Canonical way is to use min_t(), please respin (no need to explain this
> trivia in changelog)
Well, max_t() here, obviously :)
