Re: [Xen-devel] [PATCH 1/2] xen: add LZ4 decompression support

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-09-23 at 15:54 +0100, Jan Beulich wrote:
> Add support for LZ4 decompression in Xen. LZ4 Decompression APIs for
> Xen are based on LZ4 implementation by Yann Collet.
> 
> Benchmark Results(PATCH v3)
> Compiler: Linaro ARM gcc 4.6.2
> 
> 1. ARMv7, 1.5GHz based board
> [...]
> 2. ARMv7, 1.7GHz based board

BTW Xen doesn't use these decompressors on ARM, the kernel self extracts
in guest context. I see you aren't adding this to the ARM build anyway,
just thought I'd explain ;-)

[...]
> Russell King said that we should have:
> 
>  - one decompressor which is the fastest
>  - one decompressor for the highest compression ratio
>  - one popular decompressor (eg conventional gzip)
> 
> If we have a replacement one for one of these, then it should do exactly
> that: replace it.

What a shame this logic doesn't apply to Xen's use too since we need to
support old kernels :-(

Ian.


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