netdev - Re: [PATCH net-next-2.6] net_sched: RCU conversion of stab

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Message-Id: <20110120.165627.128607017.davem@davemloft.net>
Date:	Thu, 20 Jan 2011 16:56:27 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, kaber@...sh.net, hawk@...u.dk,
	jarkao2@...il.com, hadi@...erus.ca
Subject: Re: [PATCH net-next-2.6] net_sched: RCU conversion of stab

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 20 Jan 2011 14:48:19 +0100

> This patch converts stab qdisc management to RCU, so that we can perform
> the qdisc_calculate_pkt_len() call before getting qdisc lock.
> 
> This shortens the lock's held time in __dev_xmit_skb().
> 
> This permits more qdiscs to get TCQ_F_CAN_BYPASS status, avoiding lot of
> cache misses and so reducing latencies.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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