Overrides for the kernel zlib

Use the dfltcc= kernel parameter to override the defaults for the kernel zlib.

6.10 LPAR mode z/VM guest KVM guest

Format

dfltcc= syntax

Read syntax diagramSkip visual syntax diagramdfltcc=ondfltcc=offdfltcc=def_onlydfltcc=inf_onlydfltcc=always
on
enables on-chip acceleration for compression level 1 and for decompression. This is the default.
off
turns off on-chip acceleration for both compression and decompression.
def_only
enables on-chip acceleration for compression on level 1 but not for decompression.
inf_only
enables on-chip acceleration for decompression only.
always
enables on-chip acceleration for decompression and for compression regardless of the requested compression level.
Note: On-chip compression with the Integrated Accelerator for zEDC is approximately equivalent to compression level 1. Forcing On-chip compression for software that requests a higher compression level can result in a larger compressed data volume than intended by the author of the software.

Examples

dfltcc=inf_only