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: <20160419181644.GA40600@kafai-mba.local>
Date:	Tue, 19 Apr 2016 11:18:02 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Eric Dumazet <edumazet@...gle.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 10:35:52AM -0700, Eric Dumazet wrote:
> 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
I looked at the patch but I probably am missing something :(
Is checking txstamp_ack alone enough and SKBTX_ACK_TSTAMP is not needed
since they are always set together?