Andi> x86-64 will eventually too, I definitely plan for it at some
Andi> point. We need it for very big machines where 255 interrupt
Andi> vectors are not enough. And as you say with MSI-X it becomes
Andi> even more important.
MSI-X already works fine on x86-64. For example, on the machine I'm
sending this from, an Athlon64 system with Nforce 4 (and yes I am
using IP-over-InfiniBand as the only network connection on my workstation):
$ arch
x86_64
$ cat /proc/interrupts
CPU0
0: 1340159746 IO-APIC-edge timer
7: 2 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
15: 13333990 IO-APIC-edge ide1
50: 3 PCI-MSI-X ib_mthca (async)
58: 480844 PCI-MSI-X ib_mthca (cmd)
177: 7975072 IO-APIC-level libata, NVidia CK804
185: 2093654 IO-APIC-level libata
193: 14304257 IO-APIC-level nvidia
201: 769996 IO-APIC-level ohci_hcd
209: 2 IO-APIC-level ehci_hcd
217: 3 IO-APIC-level ohci1394
233: 37917879 PCI-MSI-X ib_mthca (comp)
NMI: 148617
LOC: 1340049308
ERR: 0
MIS: 0
$ lspci
0000:00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
0000:00:01.0 ISA bridge: nVidia Corporation: Unknown device 0050 (rev a3)
0000:00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
0000:00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
0000:00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
0000:00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)
0000:00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev a2)
0000:00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev a3)
0000:00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev a3)
0000:00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
0000:00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
0000:00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
0000:00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
0000:00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
0000:00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
0000:00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
0000:00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
0000:00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
0000:00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
0000:01:00.0 VGA compatible controller: nVidia Corporation: Unknown device 0140 (rev a2)
0000:03:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex (rev a0)
0000:05:0b.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)
0000:05:0c.0 Ethernet controller: Marvell Technology Group Ltd. Gigabit Ethernet Controller (rev 13)
$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 31
model name : AMD Athlon(tm) 64 Processor 3500+
stepping : 0
cpu MHz : 1005.169
cache size : 512 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 pni syscall nx mmxext fxsr_opt lm 3dnowext 3dnow lahf_lm
bogomips : 1988.42
TLB size : 1088 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
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