[Linuxppc-users] hardware transactions on power9

[Dan Horák]

On Mon, 9 Jul 2018 10:20:55 -0600
"Steve Pittman" <pittman6 at us.ibm.com> wrote:

> 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.

he is, AFAIK transactional memory support depends on CPU revision and
firmware versions

https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-June/174997.html


		Dan
 
> 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
> 
> [attachment "testhtm.cc" deleted by Steve Pittman/San Francisco/IBM] 
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