# Mender-binary-delta-generator - default xdelta3 parameters

**URL:** <https://hub.mender.io/t/mender-binary-delta-generator-default-xdelta3-parameters/6443>\
**Category:** General Discussions\
**Tags:** mender-binary-delta-generator\
**Created:** [January 8, 2024, 5:08pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-default-xdelta3-parameters/6443 "2024-01-08T17:08:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bssi](https://avatars.discourse-cdn.com/v4/letter/b/ac91a4/32.png) [@bssi](https://hub.mender.io/u/bssi)\
**Post date:** [January 8, 2024, 5:08pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-default-xdelta3-parameters/6443/1 "2024-01-08T17:08:42Z")

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Hello,

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

Cheers,  
Zach

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**Author:** ![TheYoctoJester](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/theyoctojester/32/1444_2.png) [@TheYoctoJester](https://hub.mender.io/u/TheYoctoJester)\
**Post date:** [January 9, 2024, 9:17am UTC](https://hub.mender.io/t/mender-binary-delta-generator-default-xdelta3-parameters/6443/2 "2024-01-09T09:17:42Z")

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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](https://github.com/jmacd/xdelta/blob/7508fd2a823443b1f0173ca361620f21d62a7d37/xdelta3/xdelta3.h#L43).

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

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<div class="post-metadata">

**Author:** ![bssi](https://avatars.discourse-cdn.com/v4/letter/b/ac91a4/32.png) [@bssi](https://hub.mender.io/u/bssi)\
**Post date:** [January 9, 2024, 3:39pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-default-xdelta3-parameters/6443/3 "2024-01-09T15:39:11Z")

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> [@TheYoctoJester](#):
>
> Josef

Hi Josef,

Thanks very much. That is quite helpful!

Cheers,  
Zach