Just checked Eoan's master tree and this config patch is in and tagged with
Ubuntu-5.3.0-11.12 (and newer) and since there is already 5.3.0.13.14 in Eoan's
release pocket:
"linux-generic | 5.3.0.13.14 | eoan | s390x"
I'm closing this ticket as Fix Released.
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
** Information type changed from Private to Public
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https://bugs.launchpad.net/bugs/1841193
Title:
s390x load + decompress time of kernel image with lz4 is 2x slower
than lzo
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Bug description:
Canonical Kernel Performance Team has been doing benchmarks on loading
& decompressing time of the kernel images to select the fastest
compression.
On x86_64 lz4 came out as the best one.
On our s390x load + decompress time of kernel image with lz4 appeared
to be 2x slower than lzo. Tested on z13 mainframde, whilst kernel is
compiled targetingging -march=zEC12. Which is a bit surprising. Are
there any performance improvements that can be done to kernel lz4?
You can see assessment details over at the public bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840934
I wonder if IBM teams can try different kernel compression algorithms
to doublecheck that indeed load+decompress time of lzo kernel image is
the fastest, and faster than lz4 or gzip.
Also, would that change with z14 and the hw accelerated decompression
there? Is that implemented for the kernel decompressors?
We will be switching kernel image compression to lzo with the v5.3
kernel on s390x.
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