makedumpfile 1.5.4, 734G kdump tests

[Vivek Goyal]

On Tue, Jul 09, 2013 at 11:24:03AM -0500, Cliff Wickman wrote:

[..]
> UV2000   memory: 734G
> makedumpfile: makedumpfile-1.5.4
> kexec:   git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
> booted with   crashkernel=1G,high crashkernel=192M,low
> non-cyclic mode
> 
> write to       option            init&scan sec.   copy sec.  dump size
> -------------  -----------------           ----   ---------  ---------
> megaraid disk  no compression                19          91      11.7G
> megaraid disk  zlib compression              20         209       1.4G
> megaraid disk  snappy compression            20          46       2.4G
> megaraid disk  snappy compression no mmap    30          72       2.4G
> /dev/null      no compression                19          28          -
> /dev/null      zlib compression              19         206          -
> /dev/null      snappy compression            19          41          -
> 
> Notes and observations
> - Snappy compression is a big win over zlib compression; over 4 times faster
>   with a cost of relatively little disk space.

Thanks for the results Cliff. If it is not too much of trouble, can you
please also test with lzo compression on same configuration. I am 
curious to know how much better snappy performs as compared to lzo.

Thanks
Vivek