netdev - Re: [RFC PATCH v2 net-next 2/7] tcp: Merge tx_flags/tskey/txstamp_ack in tcp_collapse

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Message-ID: <CANn89iJ=Kk3oNbkJ4pOg6bnvJFOUjJa6SSem1jb=BOkR0FF=3g@mail.gmail.com>
Date:	Tue, 19 Apr 2016 10:35:52 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	Martin KaFai Lau <kafai@...com>
Cc:	Soheil Hassas Yeganeh <soheil@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Soheil Hassas Yeganeh <soheil.kdev@...il.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Kernel Team <kernel-team@...com>
Subject: Re: [RFC PATCH v2 net-next 2/7] tcp: Merge tx_flags/tskey/txstamp_ack
 in tcp_collapse_retrans

On Tue, Apr 19, 2016 at 10:28 AM, Martin KaFai Lau <kafai@...com> wrote:

> A bit off topic, I feel like the SKBTX_ACK_TSTAMP and txstamp_ack are sort
> of redundant but I have not look into the details yet, so not completely
> sure.  It wwould be a separate cleanup patch if it is the case.

Please read 6b084928baac562ed61866f540a96120e9c9ddb7 changelog ;)

A cache line miss avoidance is critical