netdev - Re: [PATCH net-next v3 07/11] tcp: Prevent coalesce/collapse when skb has MPTCP extensions

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Message-ID: <6411d0366a6ec6a30f9dbf4117ea6d1f@codeaurora.org>
Date:   Wed, 18 Dec 2019 14:36:09 -0700
From:   subashab@...eaurora.org
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:     David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
        netdev@...r.kernel.org, mptcp@...ts.01.org,
        netdev-owner@...r.kernel.org
Subject: Re: [PATCH net-next v3 07/11] tcp: Prevent coalesce/collapse when skb
 has MPTCP extensions

> Ok, understood. Not every packet has this MPTCP extension data so
> coalescing was not always turned off, but given the importance of
> avoiding
> 
> this memory waste I'll confirm GRO behavior and work on maintaining
> coalesce/collapse with identical MPTCP extension data.
> 

Hi Mat

Are identical MPTCP extensions a common case?
AFAIK the data sequence number and the subflow sequence number change
per packet even in a single stream scenario.