[tor-relays] libzstd and/or liblzma

[Felix <zwiebel@xxxxxxxxxxxxxxxx>]

>> Can somebody please help me understand the change log for
>> 3.1.x: "Support for these algorithms requires that tor is
>> built with the libzstd and/or
>> liblzma libraries available." Is it AND or OR or something whatever
>> different ?
>
>
> Hi!  Let me try to clear it up:
>
> If Tor is built with liblzma available, it will use liblzma when
> appropriate.  The lzma format is expensive to calculate, but it
> provides very good compression, so we only use it for cases when we
> can compress something once and server it many many times -- like
> consensus documents, or consensus diffs.
>
> If Tor is built with libzstd available, it will use libzstd when
> appropriate. The zstd format is cheap to calculate, but appears to
> provide better compression than zlib on our data.
>
> If Tor is built with both libraries available, it will use either one
> when appropriate.
>
> Of course, we can only use these compression formats when both sides
> support them.

Thanks. Clear to me. So 'Liblzma N/A' should not be an issue.

--
Cheers Felix
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