Re: spin_lock behavior with ARM64 big.Little/HMP

2017-03-30 Thread Sudeep Holla
On 30/03/17 05:12, Vikram Mulukutla wrote: > > Hi Sudeep, > >> >> Interesting. Just curious if this is r0p0/p1 A53 ? If so, is the errata >> 819472 enabled ? > > Sorry for bringing this up after the loo-ong delay, but I've been > assured that the A53 involved is > r0p1. I've also confirmed thi

Re: spin_lock behavior with ARM64 big.Little/HMP

2017-03-29 Thread Vikram Mulukutla
Hi Sudeep, Interesting. Just curious if this is r0p0/p1 A53 ? If so, is the errata 819472 enabled ? Sorry for bringing this up after the loo-ong delay, but I've been assured that the A53 involved is > r0p1. I've also confirmed this problem on multiple internal platforms, and I'm pretty sur

Re: spin_lock behavior with ARM64 big.Little/HMP

2016-11-21 Thread Sudeep Holla
On 18/11/16 20:22, Vikram Mulukutla wrote: Hi Sudeep, Thanks for taking a look! On 2016-11-18 02:30, Sudeep Holla wrote: Hi Vikram, On 18/11/16 02:22, Vikram Mulukutla wrote: Hello, This isn't really a bug report, but just a description of a frequency/IPC dependent behavior that I'm curi

Re: spin_lock behavior with ARM64 big.Little/HMP

2016-11-18 Thread Vikram Mulukutla
Hi Sudeep, Thanks for taking a look! On 2016-11-18 02:30, Sudeep Holla wrote: Hi Vikram, On 18/11/16 02:22, Vikram Mulukutla wrote: Hello, This isn't really a bug report, but just a description of a frequency/IPC dependent behavior that I'm curious if we should worry about. The behavior

Re: spin_lock behavior with ARM64 big.Little/HMP

2016-11-18 Thread Sudeep Holla
Hi Vikram, On 18/11/16 02:22, Vikram Mulukutla wrote: Hello, This isn't really a bug report, but just a description of a frequency/IPC dependent behavior that I'm curious if we should worry about. The behavior is exposed by questionable design so I'm leaning towards don't-care. Consider these

spin_lock behavior with ARM64 big.Little/HMP

2016-11-17 Thread Vikram Mulukutla
Hello, This isn't really a bug report, but just a description of a frequency/IPC dependent behavior that I'm curious if we should worry about. The behavior is exposed by questionable design so I'm leaning towards don't-care. Consider these threads running in parallel on two ARM64 CPUs running