linux-kernel - Re: makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests

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Date:	Fri, 26 Jul 2013 09:23:35 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Jingbai Ma <jingbai.ma@...com>
Cc:	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kumagai-atsushi@....nes.nec.co.jp" 
	<kumagai-atsushi@....nes.nec.co.jp>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, cpw@....com,
	"Mitchell, Lisa (MCLinux in Fort Collins)" <lisa.mitchell@...com>,
	"Croxon, Nigel" <nigel.croxon@...com>,
	"Wang, Jin (Steven)" <jin.wang@...com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests

On Fri, Jul 26, 2013 at 07:42:39PM +0800, Jingbai Ma wrote:
> Hi,
> 
> I have run some tests with makedumpfile 1.5.4 and upstream kernel
> 3.11-rc2+ on a machine with 4TB memory, here is testing results:
> 
> Test environment:
> Machine: HP ProLiant DL980 G7 with 4TB RAM.
> CPU: Intel(R) Xeon(R) CPU E7- 2860  @ 2.27GHz (8 sockets, 10 cores)
> (Only 1 CPU was enabled the 2nd kernel)
> Kernel: 3.11.0-rc2+ (at patch b3a3a9c441e2c8f6b6760de9331023a7906a4ac6)
> crashkernel=384MB
> vmcore size: 4.0TB
> Dump file size: 15GB
> All measured time from debug message of makedumpfile.
> As a comparison, I also have tested makedumpfile 1.5.3.
> 
> (all time in seconds)
>                      Excluding pages   Copy data   Total
> makedumpfile 1.5.3          468         1182       1650
> makedumpfile 1.5.4           93          518        611
> 
> 
> So it seems there is a great performance improvement by the mmap mechanism.

[CC Andrew].

Thanks Jingbai for testing results. Good to see that vmcore mmap() patches
are helping.

Thanks
Vivek
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