Messages in this thread | | | Date | Wed, 05 Nov 2008 09:09:44 +0100 | From | Eric Dumazet <> | Subject | Re: [BUG] linux-2.6.28-rc3 regression: IRQ smp_affinities not respected |
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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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