netdev - Re: [PATCH 1/7] tcp: remove pointless .dsack/.num

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Date:	Sun, 15 Mar 2009 20:10:20 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] tcp: remove pointless .dsack/.num_sacks code

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Sun, 15 Mar 2009 02:07:49 +0200

> In the pure assignment case, the earlier zeroing is
> still in effect.
> 
> David S. Miller raised concerns if the ifs are there to avoid
> dirtying cachelines. I came to these conclusions:
> 
> > We'll be dirty it anyway (now that I check), the first "real" statement
> > in tcp_rcv_established is:
> >
> >       tp->rx_opt.saw_tstamp = 0;
> >
> > ...that'll land on the same dword. :-/
> >
> > I suppose the blocks are there just because they had more complexity
> > inside when they had to calculate the eff_sacks too (maybe it would
> > have been better to just remove them in that drop-patch so you would
> > have had less head-ache :-)).
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Applied.
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