netdev - Re: [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness

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Message-ID: <87634mh3ib.fsf@basil.nowhere.org>
Date:	Wed, 24 Mar 2010 03:12:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	alexander.h.duyck@...el.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] net: add additional lock to qdisc to increase enqueue/dequeue fairness

David Miller <davem@...emloft.net> writes:

> From: Alexander Duyck <alexander.h.duyck@...el.com>
> Date: Tue, 23 Mar 2010 13:25:53 -0700
>
>> The qdisc layer shows a significant issue when you start transmitting from
>> multiple CPUs.
>
> Why are you hitting any central qdisc lock on a multiqueue
> configuration?

One thing to remember is that systems can have a lot more CPUs than a NIC queues
(e.g. 64 vs 8)

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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