intel / intel/isa-l

Worse compression ratio of igzip than gzip

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Description

Hi, I am testing igzip with big genomic data (in FASTQ format). As wished, igzip is much much faster than gzip, but the compression ratio is not as good as gzip.

```
igzip = 963083897
gzip = 843154757
```

All with default setting of compression level. And for igzip, there is very little difference of `igzip -2` and `igzip -3`, whereas `gzip -9` is much better than `gzip -6`

Any tips to improve the compression ratio?

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