abalib / power-gzip Goto Github PK

Dear Bulent,

in https://github.com/abalib/power-gzip/wiki/NX-842-compression-accelerator, you wrote that the NX-842 is only accessible from Kernel space. Would it be possible to expose the NX-842 to user space analogue to what you did with NX-GZIP?

Could the changes you applied to skiboot and the Linux kernel be "re-used" for the NX-842, or do you expect major differences in exposing the hardware, e.g. as /dev/crypto/nx-842?

Thank you very much for your feedback :-)

nx-gzip-setup.pdf

I'm trying to perform some tests with power-gzip library and it's samples but I'm getting errors:

❯ ./test_deflate
ioctl() n -1, error 22
 open_device_nodes failed
nx_deflateInit err -2
❯ ../samples/gzm
ioctl() n -1, error 22
 open_device_nodes failed
zpipe: invalid compression level

My system is a Raptor Computing System Blackbird with a 4-core Power9.
Here is my system info:

❯ uname -a
Linux debian-blackbird 5.9.8 #1 SMP Mon Nov 16 13:17:13 -03 2020 ppc64le GNU/Linux
❯ zcat /proc/config.gz|grep _VAS
CONFIG_PPC_VAS=y
❯ zcat /proc/config.gz|grep DEV_NX
CONFIG_CRYPTO_DEV_NX=y
CONFIG_CRYPTO_DEV_NX_COMPRESS=y
CONFIG_CRYPTO_DEV_NX_COMPRESS_PSERIES=y
CONFIG_CRYPTO_DEV_NX_COMPRESS_POWERNV=y

I've built the kernel with NX enabled and added permissions to /dev/crypto/nx-gzip:

❯ ll /dev/crypto/nx-gzip
crw-rw-rw- 1 root root 248, 0 Nov 16 14:39 /dev/crypto/nx-gzip

Tried both master and develop branches but got same errors.

Hello Bulent

Do you have any information about availability of user space compression tools for AIX or RHEL linux running on the Power8 platform?

I am familiar with the DB2 for AIX hw compression feature per https://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP102732

we are interested in a more generic use for compressing large volumes of text files on the Power8. It appears that the required kernel hardware hooks may be available in AIX 7.1 TL3 and higher

I would appreciate your feedback