netdev - Re: [PATCH 1/2 v3] xps: Improvements in TX queue selection

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Date:	Mon, 25 Oct 2010 10:02:05 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH 1/2 v3] xps: Improvements in TX queue selection

On Sun, Oct 24, 2010 at 3:32 PM, David Miller <davem@...emloft.net> wrote:
> From: Tom Herbert <therbert@...gle.com>
> Date: Thu, 21 Oct 2010 13:17:08 -0700 (PDT)
>
>> @@ -822,8 +822,10 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
>>                                                          &md5);
>>       tcp_header_size = tcp_options_size + sizeof(struct tcphdr);
>>
>> -     if (tcp_packets_in_flight(tp) == 0)
>> +     if (tcp_packets_in_flight(tp) == 0) {
>>               tcp_ca_event(sk, CA_EVENT_TX_START);
>> +             skb->ooo_okay = 1;
>> +     }
>>
>
> You'll need to clear this flag the moment the first transmit of
> this packet happens, otherwise OOO won't be handled correctly in
> the event that fast retransmit is necessary later.
>

Would this be sufficient:

@@ -825,7 +825,8 @@ static int tcp_transmit_skb(struct sock *sk,
struct sk_buff *skb
        if (tcp_packets_in_flight(tp) == 0) {
                tcp_ca_event(sk, CA_EVENT_TX_START);
                skb->ooo_okay = 1;
-       }
+       } else
+               skb->ooo_okay = 0;
--
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