netdev - Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

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Message-ID: <20091120223723.GA4460@basil.fritz.box>
Date:	Fri, 20 Nov 2009 23:37:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

On Fri, Nov 20, 2009 at 11:30:36PM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> > 
> > Do you have numbers on this? It seems like a lot of effort to avoid transfering
> > a few cache lines.
> 
> Lot of efforts ? hmm...

Well lots of code at least. Perhaps I'm old fashioned, but I always like to have
each code justify its complexity.

It seems like a very narrow special case. Or perhaps this is something that
should be a general library function for all allocator users?

> Yes, I know, but slab/slub is already quite optimized :)

Well it still has a lot of problems, other benchmarks suffer too.

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