netdev - Re: [PATCH net-next] tcp: shrink tcp6_timewait

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Message-Id: <20131003.153158.1558578931500427624.davem@davemloft.net>
Date:	Thu, 03 Oct 2013 15:31:58 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: shrink tcp6_timewait_sock by one cache
 line

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 02 Oct 2013 04:00:04 -0700

> +	tmo = tw->tw_ttd - (u32)jiffies;
 ...
> +		tw->tw_ttd = (u32)(jiffies + timeo);
 ...
> +		tw->tw_ttd = (u32)(jiffies + (slot << INET_TWDR_RECYCLE_TICK));
 ...
> +	s32 delta = tw->tw_ttd - (u32)jiffies;
 ...
> +	s32 delta = tw->tw_ttd - (u32)jiffies;

Eric just use tcp_time_stamp in all of these locations, then you can
lose the casts and still achieve your stated objective.

Thanks.
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