Ryzen 7 - Everything on CPU0

[smartroad]

So I took the plunge and decided to get a Ryzen 7 as an upgrade from my i5 2500K. So far I am regretting the decision

 

I'll start playing a game and everything is fine. Frame rate is good and smooth. After a short while (5-10 mintues usually) the frame rate starts to tank and in some games (Elite Dangerous for one) the audio starts to break up completely. I have noticed that everything is being dumped onto CPU0 and it is maxing out. The attached image is the result of playing Deus Ex MD for about 30 minutes, as you can see even after I have exited the game CPU0 is being pumped to nearly 100% and it is causing huge lag within all programs, to the point that the mouse stops responding for a moment.

 

I have downloaded and installed the latest power plan from AMD for Ryzen and it has done little to help the matter. Windows 10 just seems to dump everything onto the first CPU and very little elsewhere.

 

I've been trying to find anything on this but all my searches of Google have not resulted in anything remotely like this. Is this what was being said about the scheduling issue with Ryzen?

[The Sloth]

did you reinstall windows? 

[DocSwag]

2 minutes ago, nerdslayer1 said:

did you reinstall windows? 

And reinstall games.

[Gameking002]

i got something alike as well but with CPU16 doing a lot, i think it is just because of applications which cant take full advantage of multi core processors such as some games.

[smartroad]

15 minutes ago, nerdslayer1 said:

did you reinstall windows? 

Yes, full install with newest drivers

12 minutes ago, DocSwag said:

And reinstall games.

Yup!

10 minutes ago, Gameking002 said:

i got something alike as well but with CPU16 doing a lot, i think it is just because of applications which cant take full advantage of multi core processors such as some games.

But with my i5 Windows would share the different threads/programs among all the cores. This is like Windows is treating the machine as a single core processor and everything is being dumped onto CPU0.

 

Just to clarify, the attached image above was taken some time after the game had finished, so what you are seeing there is not the game running, it is all the other processes being dumped onto that thread. The total CPU utilization is currently at about 9-10% with most processes using less than 2% each. Even tying this response is a test of indurance as the whole machine stutters to work

[Gameking002]

yet you can see that other threads are doing something, not much but still a little. so it cant be windows seeing it as one core. because then you would see other threads doing absolutely nothing

[smartroad]

11 minutes ago, Gameking002 said:

yet you can see that other threads are doing something, not much but still a little. so it cant be windows seeing it as one core. because then you would see other threads doing absolutely nothing

I agree, possibly a better way would be to say Windows is prioritizing CPU0 over all the other threads. So while the others are getting the odd pulse of data to process, most of the processing is being done by only one thread?

[Jito463]

Open Task Manager, find the task that's maxing out the CPU most right now, right click on it and select "Set Affinity" (may be slightly different, as I'm on a Win7 machine right now and not on my Win10 machine at home).  See if it's set to use all the cores, or if just the first one is checked.

[Gameking002]

or manually select different cores to be used for different services. in the details or processes menu (not sure which) you can select which cores (threads) are allowed to be used by that service.

[Starry_air]

Quote

Is this what was being said about the scheduling issue with Ryzen?

No, the issue was that Windows would allocate tasks to cores on different CCXs even if it didn't have to, increasing latency and potentially impacting performance (also, some people speculated Windows scheduler couldn't tell physical and logical cores apart and prioritize accordingly, but it has been disproved). By the way, the consensus at the moment seems to be that cross-CCX talk isn't that much of a problem (there is little improvement when you disable one CCX, for example). 

 

This is not something that should be happening with a game like "Deus Ex", I think - from what I've seen so far, it performs quite well on Ryzen (actually no relatively modern game should behave like this on any multi-core CPU). Are all threads maxed out when you run a heavily multi-threaded application, for example a benchmark like Cinebench? 

 

Some things you may try:

1. Update your BIOS or just reflash it if there is no update available,

2. Set all settings to default (no overclocks),

3. Disable SMT,

4. Turn on the performance power plan in Windows or download the "Ryzen balanced" plan. 

[smartroad]

1 hour ago, Starry_air said:

Some things you may try:

1. Update your BIOS or just reflash it if there is no update available,

2. Set all settings to default (no overclocks),

3. Disable SMT,

4. Turn on the performance power plan in Windows or download the "Ryzen balanced" plan. 

Cheers for that, I will try your suggestions tomorrow and feedback

[smartroad]

On 14/05/2017 at 9:03 PM, Starry_air said:

Some things you may try:

1. Update your BIOS or just reflash it if there is no update available,

2. Set all settings to default (no overclocks),

3. Disable SMT,

4. Turn on the performance power plan in Windows or download the "Ryzen balanced" plan.

So I done each in turn and nothing, same issue with windows wanting to put everything on CPU0. In desperation I reinstalled Windows again and amazingly it seems to be working correctly. The attached image is in general use, you can see now all the tasks are being spread over the cores/threads much better. While in game it is much more even

 

Seems sorted so thanks for all the help and suggestions, now to see how far I can overclock hehe