On Fri, Sep 1, 2023 at 9:02 AM Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
On Fri, Sep 01, 2023 at 07:10:59AM -0500, Richard Shaw wrote:
> Drive by comment because I found this thread interesting...
>
> What compression level was used for zstd? My understanding is that higher
> levels take longer to compress but decompression time remains virtually the
> same.
Seems to be the default level? Or at least it doesn't seem like it is
being set. Can you tell from this code:
https://gitlab.com/qemu-project/qemu/-/blob/17780edd81d27fcfdb7a802efc870a99788bd2fc/block/qcow2-threads.c#L176
Yeah didn't see anything referencing the `compression_level` property, and the default is 3. If compression performance doesn't matter as much I would try increasing it to maybe 9? The levels are 1 to 22 but I'm sure there's a diminishing return.
Thanks,
Richard
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