linux-kernel - Re: [BUG] linux-2.6.28-rc3 regression: IRQ smp

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Date:	Wed, 05 Nov 2008 09:09:44 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	ut <mchan@...adcom.com>
CC:	linux kernel <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [BUG] linux-2.6.28-rc3 regression: IRQ smp_affinities not respected

Michael Chan a écrit :
> Eric Dumazet wrote:
> 
>> Hi all
>>
>> One more problem it seems on 2.6.28-rc3
>>
>> I wanted to get maximal throughput from my machine on a
>> network bench with 3 Gigabit
>> links delivering 600.000 packets per second, so I tried to
>> play with smp_affinity to
>> dedicate one CPU for each NIC.
>>
>> It worked with 2.6.27, so there is a regression on this part.
> 
> I believe this may be the patch that broke it:
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ce6fce4295ba727b36fdc73040e444bd1aae64cd
> 
> I don't remember all the details, but the Broadcom 5708 chip is
> affected because it does not support MSI per-vector masking.
> 
> One way to get around is to disable MSI with bnx2 parameter
> disable_msi=1.
> 

Thanks Michael for your fast answer


I tried this MSI disabling and yes, it now works.

 16:      42726        128        105        106         89         89        145        152   IO-APIC-fasteoi   uhci_hcd:usb1, eth0, eth1

But I now have same interrupt used on two NIC, so I cannot split the load on two CPUS, unless
using a smp_affinity with 2 CPUS on it. Not exactly what I wanted to do..

Do you know if BCM5715S (tg3 driver) have same problem ?

03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708S Gigabit Ethernet (rev 12)
        Subsystem: Hewlett-Packard Company NC373i Integrated Multifunction Gigabit Server Adapter
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 16
        Memory at f6000000 (64-bit, non-prefetchable) [size=32M]
        [virtual] Expansion ROM at d1300000 [disabled] [size=16K]
        Capabilities: [40] PCI-X non-bridge device.
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
        Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-

07:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708S Gigabit Ethernet (rev 12)
        Subsystem: Hewlett-Packard Company NC373i Integrated Multifunction Gigabit Server Adapter
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 16
        Memory at fa000000 (64-bit, non-prefetchable) [size=32M]
        [virtual] Expansion ROM at d1000000 [disabled] [size=16K]
        Capabilities: [40] PCI-X non-bridge device.
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
        Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-

14:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
        Subsystem: Hewlett-Packard Company NC326m PCIe Dual Port Adapter
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 46
        Memory at fdff0000 (64-bit, non-prefetchable) [size=64K]
        Memory at fdfe0000 (64-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at d1200000 [disabled] [size=128K]
        Capabilities: [40] PCI-X non-bridge device.
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
        Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable+

14:04.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S Gigabit Ethernet (rev a3)
        Subsystem: Hewlett-Packard Company NC326m PCIe Dual Port Adapter
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 16
        Memory at fdfd0000 (64-bit, non-prefetchable) [size=64K]
        Memory at fdfc0000 (64-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at d1220000 [disabled] [size=128K]
        Capabilities: [40] PCI-X non-bridge device.
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
        Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable-

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