Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-27 Thread Thomas Gleixner
On Wed, 26 Sep 2018, Rob Prowel wrote: > On 09/23/18 17:19, Thomas Gleixner wrote: > > > > > > Other than RTFM, or please build a bunch of kernels from source on your > > > slow > > > machine, using differing config options to help track down the cause of > > > this...any thoughts about a

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-27 Thread Thomas Gleixner
On Wed, 26 Sep 2018, Rob Prowel wrote: > On 09/23/18 17:19, Thomas Gleixner wrote: > > > > > > Other than RTFM, or please build a bunch of kernels from source on your > > > slow > > > machine, using differing config options to help track down the cause of > > > this...any thoughts about a

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-26 Thread Rob Prowel
On 09/23/18 17:19, Thomas Gleixner wrote: Other than RTFM, or please build a bunch of kernels from source on your slow machine, using differing config options to help track down the cause of this...any thoughts about a solution? Yes. This was decoded recently as an issue on 32bit due to a

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-26 Thread Rob Prowel
On 09/23/18 17:19, Thomas Gleixner wrote: Other than RTFM, or please build a bunch of kernels from source on your slow machine, using differing config options to help track down the cause of this...any thoughts about a solution? Yes. This was decoded recently as an issue on 32bit due to a

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-24 Thread Rob Prowel
On 09/24/18 02:23, Thomas Gleixner wrote: No that thing does not affect 64bit for sure. Can you please provide me a full dmesg from that machine? Will do. See attached dmesg.txt file [0.00] Linux version 4.18.7-100.fc27.x86_64 (mockbu...@bkernel04.phx2.fedoraproject.org) (gcc

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-24 Thread Rob Prowel
On 09/24/18 02:23, Thomas Gleixner wrote: No that thing does not affect 64bit for sure. Can you please provide me a full dmesg from that machine? Will do. See attached dmesg.txt file [0.00] Linux version 4.18.7-100.fc27.x86_64 (mockbu...@bkernel04.phx2.fedoraproject.org) (gcc

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-24 Thread Thomas Gleixner
On Sun, 23 Sep 2018, Rob Prowel wrote: > On 09/23/18 17:19, Thomas Gleixner wrote: > > It's in the 4.18.8 stable kernel, which should be available from your > > fedora repo anytime soon. > > > Will check with the newer kernel when it's available but please do double > check if this problem might

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-24 Thread Thomas Gleixner
On Sun, 23 Sep 2018, Rob Prowel wrote: > On 09/23/18 17:19, Thomas Gleixner wrote: > > It's in the 4.18.8 stable kernel, which should be available from your > > fedora repo anytime soon. > > > Will check with the newer kernel when it's available but please do double > check if this problem might

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Rob Prowel
On 09/23/18 17:19, Thomas Gleixner wrote: What is that value for the second Athlon core (seems extremely bogus), and would/could that be the reason for the schedule_timeouts? This bogus value also shows up in the bootup log when the second core is activated. Seems to be AMD specific, as

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Rob Prowel
On 09/23/18 17:19, Thomas Gleixner wrote: What is that value for the second Athlon core (seems extremely bogus), and would/could that be the reason for the schedule_timeouts? This bogus value also shows up in the bootup log when the second core is activated. Seems to be AMD specific, as

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Thomas Gleixner
On Sun, 23 Sep 2018, Rob Prowel wrote: > Sep 23 01:51:28 files kernel: INFO: rcu_sched detected stalls on CPUs/tasks: > Sep 23 01:51:28 files kernel: 1-...!: (0 ticks this GP) idle=27c/0/0 > softirq=35425/35425 fqs=0 > Sep 23 01:51:28 files kernel: (detected by 0, t=60009 jiffies,

Re: AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Thomas Gleixner
On Sun, 23 Sep 2018, Rob Prowel wrote: > Sep 23 01:51:28 files kernel: INFO: rcu_sched detected stalls on CPUs/tasks: > Sep 23 01:51:28 files kernel: 1-...!: (0 ticks this GP) idle=27c/0/0 > softirq=35425/35425 fqs=0 > Sep 23 01:51:28 files kernel: (detected by 0, t=60009 jiffies,

AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Rob Prowel
Please CC me on comments. I'm seeing a lot of these errors on my dual core fileserver: --- Sep 23 01:51:28 files kernel: INFO: rcu_sched detected stalls on CPUs/tasks: Sep 23 01:51:28 files kernel: 1-...!: (0 ticks

AMD Athlon bogus performance value causing RCU stalls?

2018-09-23 Thread Rob Prowel
Please CC me on comments. I'm seeing a lot of these errors on my dual core fileserver: --- Sep 23 01:51:28 files kernel: INFO: rcu_sched detected stalls on CPUs/tasks: Sep 23 01:51:28 files kernel: 1-...!: (0 ticks