Re: makedumpfile 1.5.4, 734G kdump tests

Vivek Goyal
2013-07-11T13:07:14Z

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