netdev - Re: [PATCH v3 net-next-2.6] net_sched: sch

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Date:	Mon, 20 Dec 2010 21:33:46 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, kaber@...sh.net, jarkao2@...il.com
Subject: Re: [PATCH v3 net-next-2.6] net_sched: sch_sfq: better struct
 layouts

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 20 Dec 2010 23:54:58 +0100

> [PATCH v3 net-next-2.6] net_sched: sch_sfq: better struct layouts
> 
> This patch shrinks sizeof(struct sfq_sched_data)
> from 0x14f8 (or more if spinlocks are bigger) to 0x1180 bytes, and
> reduce text size as well.
> 
>    text    data     bss     dec     hex filename
>    4821     152       0    4973    136d old/net/sched/sch_sfq.o
>    4627     136       0    4763    129b new/net/sched/sch_sfq.o
> 
> 
> All data for a slot/flow is now grouped in a compact and cache friendly
> structure, instead of being spreaded in many different points.
> 
> struct sfq_slot {
>         struct sk_buff  *skblist_next;
>         struct sk_buff  *skblist_prev;
>         sfq_index       qlen; /* number of skbs in skblist */
>         sfq_index       next; /* next slot in sfq chain */
>         struct sfq_head dep; /* anchor in dep[] chains */
>         unsigned short  hash; /* hash value (index in ht[]) */
>         short           allot; /* credit for this slot */
> };
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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