Hi,
Are the packets correctly distributed to different queues? (look at
/proc/interrupts).
RSS which is used to split packets among queues only supports up to 16
queues. Moreover, for the hash function to be effective the packets have to
be different (if you use a pktgen, that might not be the case).
Cheers,
Tom
*Tom Barbette*
2014-12-18 9:33 GMT+01:00 lzh <lhqlzh...@163.com>:
>
>
>
>
> There is a another problem. When we set all 20 irqs to both cpu0 and
> cpu1(echo 3 > "/proc/irq/<rxtx_irq_id>/smp_affinity".), the irq all go to
> cpu0.
> We use x86 64bit. so the irq balance is done by apic hardware (setting
> "msi_set_affinity" in linux/arch/x86/kernel/apic/io_apic.c), why it doesn't
> take effect?
>
>
> At 2014-12-18 11:12:40, "lzh" <lhqlzh...@163.com> wrote:
>
> Hi,
> We are using 82599 intel netcard that using 20 rxtx queues. We test
> it on cpu E5-2670 which has 20 cpu cores. We bind every queues to each cpu
> by "/proc/irq/<rxtx_irq_id>/smp_affinity".
> First, we test the throughput and find that the rx irq is not
> distributed to all cpu cores. Wd don't know why?
>
> Seconde, we check the driver of ixgbe, and found three macros as
> follows:
> #define IXGBE_DCA_RXCTRL_CPUID_MASK 0x0000001F /* Rx CPUID Mask */
> #define IXGBE_DCA_RXCTRL_CPUID_MASK_82599 0xFF000000 /* Rx CPUID
> Mask */
> #define IXGBE_DCA_RXCTRL_CPUID_SHIFT_82599 24 /* Rx CPUID Shift */
> Does it means that 82599 RSS could only return irq to most 8 irq
> queues?
>
> Any body could help?
> Thank you.
>
> Best,
> Liu.
>
>
>
>
>
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