netdev - Re: [RFC PATCH] dynamic_queue_limit.h: Make the struct ___cacheline_aligned_on

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Message-ID: <1354897144.26405.4.camel@edumazet-glaptop>
Date:	Fri, 07 Dec 2012 08:19:04 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Tom Herbert <therbert@...gle.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH] dynamic_queue_limit.h: Make the struct
 ___cacheline_aligned_on_smp

On Fri, 2012-12-07 at 08:05 -0800, Joe Perches wrote:

> So it seemed somewhat sensible to make the
> entire struct in a single cacheline.

Any layout change in an object used in network fast path need a complete
performance study.

Even if you provide such a study, we'll need to reproduce your numbers
here.

BQL/DQL is not on our radars, spending two cache lines on a critical
object is fine.

Thanks


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