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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1392178661.1752.1.camel@edumazet-glaptop2.roam.corp.google.com>
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.




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/