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* makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests
@ 2013-07-26 11:42 Jingbai Ma
  2013-07-26 13:23 ` Vivek Goyal
  0 siblings, 1 reply; 2+ messages in thread
From: Jingbai Ma @ 2013-07-26 11:42 UTC (permalink / raw)
  To: kexec@lists.infradead.org, linux-kernel@vger.kernel.org
  Cc: kumagai-atsushi@mxc.nes.nec.co.jp, HATAYAMA Daisuke, Vivek Goyal,
	Eric W. Biederman, cpw, Mitchell, Lisa (MCLinux in Fort Collins),
	Croxon, Nigel, Jingbai Ma, Wang, Jin (Steven)

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.

--
Thanks,
Jingbai Ma

^ permalink raw reply	[flat|nested] 2+ messages in thread
* Re: makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests
  2013-07-26 11:42 makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests Jingbai Ma
@ 2013-07-26 13:23 ` Vivek Goyal
  0 siblings, 0 replies; 2+ messages in thread
From: Vivek Goyal @ 2013-07-26 13:23 UTC (permalink / raw)
  To: Jingbai Ma
  Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	kumagai-atsushi@mxc.nes.nec.co.jp, HATAYAMA Daisuke,
	Eric W. Biederman, cpw, Mitchell, Lisa (MCLinux in Fort Collins),
	Croxon, Nigel, Wang, Jin (Steven), Andrew Morton

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

^ permalink raw reply	[flat|nested] 2+ messages in thread
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