** Changed in: gzip (Ubuntu) Status: New => In Progress ** Changed in: gzip (Ubuntu) Importance: Undecided => High
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to zlib in Ubuntu. https://bugs.launchpad.net/bugs/1884514 Title: [FFe][20.10 FEAT] zlib/gzip hardware compression enablement Status in Ubuntu on IBM z Systems: Fix Released Status in gzip package in Ubuntu: In Progress Status in zlib package in Ubuntu: Fix Released Bug description: [Feature Freeze Exception] 1. Feature: The latest s390x hardware comes with a new concept for hardware assisted compression/decompression, based on a 'Next Accelerator Function unit' (NXU). This is an on-chip concept, a co-processor for compression available to all cores on the same chip. It provides functions as normal 'problem state' instructions (in other words user space instructions that are directly consumable by libraries and applications) and supports DEFLATE compliant compression/decompression + GZIP CRC/ZLIB Adler. To enable this hardware support for zlib and gzip, zlib needs to be compiled with CFLAGS="-O2 -DDFLTCC -DDFLTCC_LEVEL_MASK=0x7e". The value of 0x7e enables hardware compression for the compression levels 1-6 (out of 0-9). There is a significant business value of having the enablement active by default, since tests on a system with 4 IFLs and hardware compression enabled this way offered (especially for DEFLATE as best case) a speed up of more than 40x. 2. Changes Adding CFLAGS="-O2 -DDFLTCC -DDFLTCC_LEVEL_MASK=0x7e" attributes/macro during build of zlib and gzip. 3. Regression risk The concept is new and comes with IBM z15 and LinuxONE III only and is with that specific and limited to s390x. Hence a potential regressions of this late addition would be limited to s390x and there again with the above changes to zlib (and gzip). In case of unforeseen issues with the NXU hardware component, a fallback to software is done. On top a modified zlib package was build and made available in a PPA for further testing. This change should have been included earlier, but was blocked by other zlib tickets/bugs that needed to be fixed and integrated first (like LP 1893170), hence this request for late addition. __________ HW Compression need to be enabled with Default-Compression-Level 6. Adding following CFLAGS attributes during build of zlib and gzip "-DDFLTCC_LEVEL_MASK=0x7e" CFLAGS="-O2 -DDFLTCC -DDFLTCC_LEVEL_MASK=0x7e" ./configure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1884514/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp