On 04/07/2017 08:07 AM, Cédric Le Goater wrote: > On 04/07/2017 07:24 AM, Nikunj A Dadhania wrote: >> Cédric Le Goater <c...@kaod.org> writes: >> >>> Hello Nikunj, >>> >>> On 04/06/2017 12:22 PM, Nikunj A Dadhania wrote: >>>> The series enables Multi-Threaded TCG on PPC64 >>>> >>>> Patch 01: Use atomic_cmpxchg in store conditional >>>> 02: Handle first write to page during atomic operation >>>> 03: Generate memory barriers for sync/isync and load/store >>>> conditional >>>> >>>> Patches are based on ppc-for-2.10 >>>> >>>> Tested using following: >>>> ./ppc64-softmmu/qemu-system-ppc64 -cpu POWER8 -vga none -nographic >>>> -machine pseries,usb=off -m 2G -smp 8,cores=8,threads=1 -accel >>>> tcg,thread=multi f23.img >>> >>> I tried it with a Ubuntu 16.04.2 guest using stress --cpu 8. It looked >>> good : the CPU usage of QEMU reached 760% on the host. >> >> Cool. >> >>>> Todo: >>>> * Enable other machine types and PPC32. >>> >>> I am quite ignorant on the topic. >>> Have you looked at what it would take to emulate support of the HW >>> threads ? >> >> We would need to implement msgsndp (doorbell support for IPI between >> threads of same core) > > ok. I get it. Thanks, > >>> and the PowerNV machine ? >> >> Haven't tried it, should work. Just give a shot, let me know if you see >> problems. > > sure. pnv is still on 2.9, so I will rebase on 2.10, merge your > patches and tell you.
The system seems to be spinning in skiboot in cpu_idle/relax when starting the linux kernel. It finally boots, but it is rather long. David has merged enough to test if you want to give it a try. Cheers, C.
