Re: makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests
From: Vivek Goyal
Date: Fri Jul 26 2013 - 09:24:18 EST
On Fri, Jul 26, 2013 at 07:42:39PM +0800, Jingbai Ma wrote:
> 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)
> 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 for testing results. Good to see that vmcore mmap() patches
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