[Linuxppc-users] hardware transactions on power9

[Steve Pittman]

Peter,

At 
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/7.5_release_notes/index 
I see:

 Red Hat Enterprise Linux 7.5 is distributed with the kernel-alt packages, 
which include kernel version 4.14. This kernel version provides support 
for the following architectures:
64-bit ARM
IBM POWER9 (little endian)
IBM z Systems 

Are you running the 4.14 kernel from the kernal-alt packages?  If not, you 
do not have full RHEL 7.5 support for the POWER9 processor.

Steve Pittman



From:   Peter Pirkelbauer <pirkelbauer at uab.edu>
To:     linuxppc-users at lists.ozlabs.org
Date:   07/09/2018 10:01 AM
Subject:        [Linuxppc-users] hardware transactions on power9
Sent by:        "Linuxppc-users" 
<linuxppc-users-bounces+skywalker=alum.mit.edu at lists.ozlabs.org>



Hi,

I am working on concurrent data structures built on top of hardware 
transactions.

Recently, I started testing on a Power 9 and ran into a problem with code 
that works well on a Power 8. When a transaction is started with 
__builtin_tbegin(0) the code terminates with an illegal instruction 
exception. (complete sample code is attached).

I used gcc 8.1 (compiled on the Power9) and I also tried gcc 7.3 to 
cross-compile on a power 8. The switch -mcpu=power9 was used on both 
systems.

The Power9 identifies as:
processor    : 159
cpu        : POWER9 (raw), altivec supported
clock        : 3000.000000MHz
revision    : 2.1 (pvr 004e 1201)

timebase    : 512000000
platform    : PowerNV
model        : 8335-GTG
machine        : PowerNV 8335-GTG
firmware    : OPAL
MMU        : Radix

The Power 9 system runs Red Hat Enterprise Linux Server release 7.5 
(Maipo) and uname gives:
Linux cheaha02 4.14.0-49.2.2.el7a.ppc64le #1 SMP Fri Apr 27 15:37:52 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux

I would appreciate any insights or pointers to relevant documentation.

Thank you,
Peter

-----
Peter Pirkelbauer, Ph.D.
Assistant Professor
http://iprogress.cis.uab.edu


Dept. of Computer Science
136 Campbell Hall
University of Alabama at Birmingham
1300 University Boulevard, Birmingham, Alabama 35294-1170
phone: (205) 934-8532

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