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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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280ff97494
irq_choose_cpu() should compare the affinity mask against cpu_online_map
rather than CPU_MASK_ALL, since irq_select_affinity() sets the interrupt's
affinity mask to cpu_online_map "and" CPU_MASK_ALL (which ends up being
just cpu_online_map). The mask comparison in irq_choose_cpu() will always
fail since the two masks are not the same. So the CPU chosen is the first CPU
in the intersection of cpu_online_map and CPU_MASK_ALL, which is always CPU0.
That means all interrupts are reassigned to CPU0...
Distributing interrupts to CPUs in a linearly increasing round robin fashion
is not optimal for the UltraSPARC T1/T2. Also, the irq_rover in
irq_choose_cpu() causes an interrupt to be assigned to a different
processor each time the interrupt is allocated and released. This may lead
to an unbalanced distribution over time.
A static mapping of interrupts to processors is done to optimize and balance
interrupt distribution. For the T1/T2, interrupts are spread to different
cores first, and then to strands within a core.
The following is some benchmarks showing the effects of interrupt
distribution on a T2. The test was done with iperf using a pair of T5220
boxes, each with a 10GBe NIU (XAUI) connected back to back.
TCP | Stock Linear RR IRQ Optimized IRQ
Streams | 2.6.30-rc5 Distribution Distribution
| GBits/sec GBits/sec GBits/sec
--------+-----------------------------------------
1 0.839 0.862 0.868
8 1.16 4.96 5.88
16 1.15 6.40 8.04
100 1.09 7.28 8.68
Signed-off-by: Hong H. Pham <hong.pham@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
103 lines
3.2 KiB
Makefile
103 lines
3.2 KiB
Makefile
#
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# Makefile for the linux kernel.
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#
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asflags-y := -ansi
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ccflags-y := -Werror
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extra-y := head_$(BITS).o
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extra-y += init_task.o
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extra-y += vmlinux.lds
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obj-$(CONFIG_SPARC32) += entry.o wof.o wuf.o
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obj-$(CONFIG_SPARC32) += etrap_32.o
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obj-$(CONFIG_SPARC32) += rtrap_32.o
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obj-y += traps_$(BITS).o
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# IRQ
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obj-y += irq_$(BITS).o
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obj-$(CONFIG_SPARC32) += sun4m_irq.o sun4c_irq.o sun4d_irq.o
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obj-y += process_$(BITS).o
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obj-y += signal_$(BITS).o
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obj-$(CONFIG_SPARC32) += ioport.o
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obj-y += setup_$(BITS).o
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obj-y += idprom.o
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obj-y += sys_sparc_$(BITS).o
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obj-$(CONFIG_SPARC32) += systbls_32.o
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obj-y += time_$(BITS).o
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obj-$(CONFIG_SPARC32) += windows.o
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obj-y += cpu.o
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obj-$(CONFIG_SPARC32) += devices.o
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obj-$(CONFIG_SPARC32) += tadpole.o
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obj-$(CONFIG_SPARC32) += tick14.o
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obj-y += ptrace_$(BITS).o
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obj-y += unaligned_$(BITS).o
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obj-y += una_asm_$(BITS).o
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obj-$(CONFIG_SPARC32) += muldiv.o
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obj-y += prom_common.o
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obj-y += prom_$(BITS).o
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obj-y += of_device_$(BITS).o
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obj-$(CONFIG_SPARC64) += prom_irqtrans.o
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obj-$(CONFIG_SPARC64) += reboot.o
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obj-$(CONFIG_SPARC64) += sysfs.o
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obj-$(CONFIG_SPARC64) += iommu.o
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obj-$(CONFIG_SPARC64) += central.o
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obj-$(CONFIG_SPARC64) += starfire.o
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obj-$(CONFIG_SPARC64) += power.o
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obj-$(CONFIG_SPARC64) += sbus.o
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obj-$(CONFIG_SPARC64) += ebus.o
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obj-$(CONFIG_SPARC64) += visemul.o
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obj-$(CONFIG_SPARC64) += hvapi.o
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obj-$(CONFIG_SPARC64) += sstate.o
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obj-$(CONFIG_SPARC64) += mdesc.o
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obj-$(CONFIG_SPARC64) += pcr.o
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obj-$(CONFIG_SPARC64) += nmi.o
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obj-$(CONFIG_SPARC64_SMP) += cpumap.o
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# sparc32 do not use GENERIC_HARDIRQS but uses the generic devres implementation
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obj-$(CONFIG_SPARC32) += devres.o
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devres-y := ../../../kernel/irq/devres.o
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obj-$(CONFIG_SPARC32) += dma.o
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obj-$(CONFIG_SPARC32_PCI) += pcic.o
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obj-$(CONFIG_SMP) += trampoline_$(BITS).o smp_$(BITS).o
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obj-$(CONFIG_SPARC32_SMP) += sun4m_smp.o sun4d_smp.o
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obj-$(CONFIG_SPARC64_SMP) += hvtramp.o
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obj-y += auxio_$(BITS).o
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obj-$(CONFIG_SUN_PM) += apc.o pmc.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULES) += sparc_ksyms_$(BITS).o
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obj-$(CONFIG_SPARC_LED) += led.o
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obj-$(CONFIG_KGDB) += kgdb_$(BITS).o
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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CFLAGS_REMOVE_ftrace.o := -pg
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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# sparc64 PCI
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obj-$(CONFIG_SPARC64_PCI) += pci.o pci_common.o psycho_common.o
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obj-$(CONFIG_SPARC64_PCI) += pci_psycho.o pci_sabre.o pci_schizo.o
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obj-$(CONFIG_SPARC64_PCI) += pci_sun4v.o pci_sun4v_asm.o pci_fire.o
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obj-$(CONFIG_PCI_MSI) += pci_msi.o
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obj-$(CONFIG_COMPAT) += sys32.o sys_sparc32.o signal32.o
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# sparc64 cpufreq
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obj-$(CONFIG_US3_FREQ) += us3_cpufreq.o
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obj-$(CONFIG_US2E_FREQ) += us2e_cpufreq.o
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obj-$(CONFIG_US3_MC) += chmc.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o ds.o
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obj-$(CONFIG_AUDIT) += audit.o
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audit--$(CONFIG_AUDIT) := compat_audit.o
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obj-$(CONFIG_COMPAT) += $(audit--y)
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