Mender-binary-delta-generator - default xdelta3 parameters

General Discussions
1

Hello,

What are the default xdelta3 parameters used if mender-binary-delta-generator is called without the -D flag?

Cheers,
Zach

2

Hi @bssi,

The defaults for mender-binary-delta-generator are the xdelta3 ones, as defined at xdelta/xdelta3/xdelta3.h at 7508fd2a823443b1f0173ca361620f21d62a7d37 · jmacd/xdelta · GitHub.

For server-side delta generation, we suggest the following defaults:

  • Compression level: 0
  • Source window size: 67108864
  • Input window size: 8388608
  • Compression duplicates window: 262144
  • Instruction buffer size: 32768

Hope this helps,
Josef

3

Hi Josef,

Thanks very much. That is quite helpful!

Cheers,
Zach

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