netdev - Re: [Question] net/mlx4_en: Memory consumption issue with mlx4

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Date:	Thu, 12 Mar 2015 10:24:01 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Martin Lau <kafai@...com>
Cc:	Amir Vadai <amirv@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>, netdev@...r.kernel.org,
	kernel-team@...com
Subject: Re: [Question] net/mlx4_en: Memory consumption issue with mlx4_en
 driver

On Thu, 2015-03-12 at 09:56 -0700, Martin Lau wrote:

> It is what we did.  However, a buggy process accommodated enough stalled
> sockets (stop reading from it but not closing it) will re-surface the problem.

That's where collapsing helps : TCP stack reallocates linear skbs using
order-0 pages only, and fill them. Overhead is reduced to strict
minimum.

Well, this collapsing code could be extended to add order-0 pages frags,
so that overhead would be really minimal.

I'll send patches that we have been using here for a while.

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