netdev - Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe

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Date:	Tue, 11 Feb 2014 20:17:41 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Sander Eikelenboom <linux@...elenboom.it>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Francois Romieu <romieu@...zoreil.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7
 overlapping mappings of pfn 55ebe

On Tue, 2014-02-11 at 18:07 -0800, Dan Williams wrote:

> The overlap granularity is too large.  Multiple dma_map_single
> mappings are allowed to a given page as long as they don't collide on
> the same cache line.
> 

I am not sure why you try number of mappings of a page.

Try launching 100 concurrent netperf -t TCP_SENFILE

Same page might be mapped more than 100 times, more than 10000 times in
some cases.




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