netdev - Re: [RFC] multiqueue changes

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Message-ID: <4ACDD762.9080101@gmail.com>
Date:	Thu, 08 Oct 2009 14:13:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC] multiqueue changes

Jarek Poplawski a écrit :
> On Thu, Oct 08, 2009 at 09:03:44AM +0000, Jarek Poplawski wrote:
> ...
>> num_tx_queues. But it seems we should rather use more often
>> real_num_tx_queue in schedulers code like dumps and maybe more
>> (like e.g. sch_multiq does).
> 
> ...i.e. probably everywhere between dev_activate and dev_deactivate
> all qdisc operations could use real_num_tx_queues (including a test
> like: netif_is_real_multique), unless I miss something.

I am not sure David intent was being able to dynamically adjust real_num_tx_queue
between 1 and num_tx_queue.

For low/moderate traffic, its better to use one queue, to lower IRQ activations,
and let some cpus sleep longer.
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