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Date:   Thu, 7 May 2020 09:58:30 -0400
From:   Neal Cardwell <>
To:     zhang kai <>
Cc:     Yuchung Cheng <>,
        Eric Dumazet <>,
        David Miller <>,
        Alexey Kuznetsov <>,
        Hideaki YOSHIFUJI <>,
        Jakub Kicinski <>,
        Netdev <>
Subject: Re: [PATCH] tcp: tcp_mark_head_lost is only valid for sack-tcp

On Wed, May 6, 2020 at 11:09 PM zhang kai <> wrote:
> so tcp_is_sack/reno checks are removed from tcp_mark_head_lost.
> Signed-off-by: zhang kai <>
> ---

Nice clean-up, thanks.

Acked-by: Neal Cardwell <>

As Eric noted in previous threads, this clean-up is now possible after:

6ac06ecd3a5d1dd1aaea5c2a8f6d6e4c81d5de6a ("tcp: simpler NewReno implementation")

As Yuchung noted, the tcp_mark_head_lost() function is not used today
when RACK is enabled (which is by


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