02-Sep-2018, 10:57 AM
Hi Agent Kith,
I'm keen to do more with CPU affinity. Ultimately, it would be great if there was something like a 3rd group that could reserve a CPU for special user defined PIDs or IRQs.
[I'm ignorant about any differences between PIDs and IRQs in this context]
First up, could you modify TOP to show the last used CPU?
Currently, I ssh TOP, hit F, scroll down to P, hit space and then escape to see this info in Terminal.
The main consumer of CPU power in my system is irq/127-xhci_hc
I'm guessing this relates to the USB output to my DAC. That is the one for which I'd like to separately assign a CPU core.
For many weeks, I have assigned CPU#3 to User, leaving #0, #1 & #2 for System. Initially when I started playing with cpuset and monitoring last used CPU, I saw that IRQ127-xh followed system (CPU#0, 1 or 2). Later it seemed to always follow User (always on CPU#3 for weeks once stopped making changes in cpuset). Today, I changed to CPU#2 & CPU#3 for User and notiiced that IRQ127-xh was using the system cores again. Back to User=CPU#3 only...IRQ still using System cores...restart...now IRQ pinned to User CPU#3.
Perhaps this is why I didn't hear much immediate effect when playing with cpuset but felt SQ was improved long-term.
Cheers,
JD
I'm keen to do more with CPU affinity. Ultimately, it would be great if there was something like a 3rd group that could reserve a CPU for special user defined PIDs or IRQs.
[I'm ignorant about any differences between PIDs and IRQs in this context]
First up, could you modify TOP to show the last used CPU?
Currently, I ssh TOP, hit F, scroll down to P, hit space and then escape to see this info in Terminal.
The main consumer of CPU power in my system is irq/127-xhci_hc
I'm guessing this relates to the USB output to my DAC. That is the one for which I'd like to separately assign a CPU core.
For many weeks, I have assigned CPU#3 to User, leaving #0, #1 & #2 for System. Initially when I started playing with cpuset and monitoring last used CPU, I saw that IRQ127-xh followed system (CPU#0, 1 or 2). Later it seemed to always follow User (always on CPU#3 for weeks once stopped making changes in cpuset). Today, I changed to CPU#2 & CPU#3 for User and notiiced that IRQ127-xh was using the system cores again. Back to User=CPU#3 only...IRQ still using System cores...restart...now IRQ pinned to User CPU#3.
Perhaps this is why I didn't hear much immediate effect when playing with cpuset but felt SQ was improved long-term.
Cheers,
JD
Facebook
X
LinkedIn
Blusky![[-]](https://forums.snakeoil-os.net/images/collapse.png "[-]")
