如下所示，nvidia 正在共享中断，并且该中断仅使用 CPU0，我如何更改 nvidia 的中断，以及如何使其使用两个 CPU？
这里是一篇描述第二个问题的文章，我可以通过修改 smp_affinity 在 CPU0 和 CPU1 之间进行更改，但不明白如何将其设置为使用两个 CPU。
根据这博客将 smp_affinity 设置为 3 应该同时使用 CPU0 和 CPU1。实际上，在我的例子中，它使用 CPU0（表现得就像它被设置为 1）。将其设置为 2 使用 CPU1。
radu@radu-work:~$ cat /proc/interrupts
CPU0 CPU1
0: 79 0 IO-APIC-edge timer
1: 9 17152 IO-APIC-edge i8042
4: 2 0 IO-APIC-edge
6: 5 0 IO-APIC-edge floppy
7: 0 0 IO-APIC-edge parport0
8: 1 0 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 694613 0 IO-APIC-edge i8042
16: 1233922 0 IO-APIC-fasteoi uhci_hcd:usb3, ahci, nvidia
17: 3961 168757 IO-APIC-fasteoi uhci_hcd:usb4, pata_jmicron
18: 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 59 0 IO-APIC-fasteoi ata_piix, ata_piix, uhci_hcd:usb6
22: 819 6915 IO-APIC-fasteoi HDA Intel
23: 2 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5, eth
radu@radu-work:~$ sudo cat /proc/irq/16/smp_affinity
1
root@radu-work:~# uname -a
Linux radu-work 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:54:21 UTC 2011 i686 GNU/Linux
谢谢。
编辑： 我正在尝试让我的 Linux 盒子播放高清电影（至少 720）。我有一个 nvidia 66xx 系列，Linux 版本 Ubuntu 11.04，我安装了 nvidia 专有驱动程序，但它们不支持旧硬件（仅 8xxx 系列及以上）的硬件加速（和视频解码），因此解码是在软件中完成的。当我尝试观看高清电影时，图像冻结了几秒钟，工作了几秒钟，然后再次冻结。 CPU 使用率引起了我的注意，nvidia 驱动程序只使用一个 CPU，所以我想如果我能让 nvidia 使用两个 CPU，也许我会有更好的性能，并最终能够在我的 Linux 机器上观看高清电影。顺便说一句，我已经尝试了所有可能的 Linux 播放器：mplayer（甚至每晚构建）、totem、vlc 等等......
编辑： 中断平衡——调试
root@radu-work:/# irqbalance --debug
Package 0: cpu mask is 00000001 (workload 0)
Cache domain 0: cpu mask is 00000001 (workload 0)
CPU number 0 (workload 0)
CPU number 0 (workload 0)
Package 0: cpu mask is 00000003 (workload 0)
Cache domain 0: cpu mask is 00000003 (workload 0)
CPU number 0 (workload 0)
CPU number 1 (workload 0)
Interrupt 44 (class ethernet) has workload 7
Interrupt 0 (class timer) has workload 0
Interrupt 16 (class storage) has workload 122
Interrupt 17 (class storage) has workload 29
Interrupt 19 (class storage) has workload 0
Interrupt 45 (class legacy) has workload 2
Interrupt 1 (class legacy) has workload 2
Interrupt 12 (class legacy) has workload 0
-----------------------------------------------------------------------------
IRQ delta is 152640
Rescanning cpu topology
Package 0: cpu mask is 00000001 (workload 0)
Cache domain 0: cpu mask is 00000001 (workload 0)
CPU number 0 (workload 0)
CPU number 0 (workload 0)
Package 0: cpu mask is 00000003 (workload 0)
Cache domain 0: cpu mask is 00000003 (workload 0)
CPU number 0 (workload 0)
CPU number 1 (workload 0)
Package 0: cpu mask is 00000001 (workload 16)
Cache domain 0: cpu mask is 00000001 (workload 16)
CPU number 0 (workload 3)
Interrupt 44 (ethernet/2)
CPU number 0 (workload 0)
Interrupt 17 (storage/9)
Interrupt 19 (storage/0)
Interrupt 45 (legacy/0)
Interrupt 12 (legacy/0)
Package 0: cpu mask is 00000003 (workload 42)
Cache domain 0: cpu mask is 00000003 (workload 42)
CPU number 0 (workload 0)
CPU number 1 (workload 0)
Interrupt 16 (storage/40)
Interrupt 1 (legacy/0)
-----------------------------------------------------------------------------
...
-----------------------------------------------------------------------------
IRQ delta is 10
IRQ delta is 10, switching to power mode
Rescanning cpu topology
Package 0: cpu mask is 00000001 (workload 0)
Cache domain 0: cpu mask is 00000001 (workload 0)
CPU number 0 (workload 0)
CPU number 0 (workload 0)
Package 0: cpu mask is 00000003 (workload 0)
Cache domain 0: cpu mask is 00000003 (workload 0)
CPU number 0 (workload 0)
CPU number 1 (workload 0)
Package 0: cpu mask is 00000001 (workload 38)
Cache domain 0: cpu mask is 00000001 (workload 38)
CPU number 0 (workload 36)
Interrupt 44 (ethernet/35)
CPU number 0 (workload 0)
Interrupt 16 (storage/0)
Interrupt 1 (legacy/0)
Package 0: cpu mask is 00000003 (workload 4)
Cache domain 0: cpu mask is 00000003 (workload 4)
CPU number 0 (workload 0)
CPU number 1 (workload 0)
Interrupt 19 (storage/0)
Interrupt 17 (storage/0)
Interrupt 45 (legacy/0)
Interrupt 12 (legacy/0)
答案1
你找错了树。让两个 CPU 都收到中断会使性能变得更差，而不是更好。一方面，这意味着软件解码器会不断被中断。另一方面，这意味着中断代码在缓存中不太可能很热。还有很多其他原因会让事情变得更糟。