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From: Vivek Goyal <vgoyal@redhat.com>
To: Jingbai Ma <jingbai.ma@hp.com>
Cc: "kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"kumagai-atsushi@mxc.nes.nec.co.jp" 
	<kumagai-atsushi@mxc.nes.nec.co.jp>,
	HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	cpw@sgi.com, "Mitchell,
	Lisa (MCLinux in Fort Collins)" <lisa.mitchell@hp.com>,
	"Croxon, Nigel" <nigel.croxon@hp.com>,
	"Wang, Jin (Steven)" <jin.wang@hp.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests
Date: Fri, 26 Jul 2013 09:23:35 -0400	[thread overview]
Message-ID: <20130726132335.GA27529@redhat.com> (raw)
In-Reply-To: <51F260AF.7010409@hp.com>

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

      reply	other threads:[~2013-07-26 13:24 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-26 11:42 makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests Jingbai Ma
2013-07-26 13:23 ` Vivek Goyal [this message]

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