netdev - Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-Id: <20080811.145047.105665450.davem@davemloft.net>
Date:	Mon, 11 Aug 2008 14:50:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cl@...ux-foundation.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28

From: Christoph Lameter <cl@...ux-foundation.org>
Date: Mon, 11 Aug 2008 16:33:43 -0500

> Maybe what we are seeing is general bloat in kernel execution paths
> due to the growth in complexity?

It could be, and any kind of analysis into this would be great.

I had a change that RCU destroyed sockets and this added a
tiny bit of latency, so I never added it even though it would
have allowed a lot of simplification of socket handling (which
I though would make up for RCU's latency, but it didn't).
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