On Wed Oct 24, 2012, Thomas Fjellstrom wrote:
> On Wed Oct 24, 2012, Laurent CARON wrote:
> > On 24/10/2012 15:16, Thomas Fjellstrom wrote:
> > > My current install doesn't have any irq's over 34. Also, only one cpu
> > > shows up in /proc/cpuinfo (or htop)
> > 
> > Mine shows 2 CPUs and lots of interrupts:
> > 
> > # lscpu
> > Architecture:          x86_64
> > CPU op-mode(s):        32-bit, 64-bit
> > CPU(s):                2
> > Thread(s) per core:    2
> > Core(s) per socket:    1
> > CPU socket(s):         1
> > NUMA node(s):          1
> > Vendor ID:             GenuineIntel
> > CPU family:            6
> > Model:                 38
> > Stepping:              1
> > CPU MHz:               1600.010
> > Virtualization:        VT-x
> > L1d cache:             24K
> > L1i cache:             32K
> > L2 cache:              512K
> > 
> > 
> > # cat /proc/interrupts
> > 
> >             CPU0       CPU1
> >    
> >    0:  725569646          0   IO-APIC-edge      timer
> >    2:          0          0    XT-PIC-XT-PIC    cascade
> >    4:          9          0   IO-APIC-edge      serial
> >    8:          0          0   IO-APIC-edge      rtc0
> >   
> >   16:          0          0   IO-APIC-fasteoi   ehci_hcd:usb2,
> > 
> > ohci_hcd:usb6, ohci_hcd:usb7, ohci_hcd:usb8, gpio_pch
> > 
> >   18:          0          0   IO-APIC-fasteoi   mmc0, mmc1
> >   19:          0          0   IO-APIC-fasteoi   ehci_hcd:usb1,
> > 
> > ohci_hcd:usb3, ohci_hcd:usb4, ohci_hcd:usb5
> > 
> >   40:  129106669          0   PCI-MSI-edge      eth0-rx-0
> >   41:  224746043       6687   PCI-MSI-edge      eth0-tx-0
> >   42:          5          0   PCI-MSI-edge      eth0
> >   43:   42467440      65846   PCI-MSI-edge      eth1-rx-0
> >   44:   13256223      10055   PCI-MSI-edge      eth1-tx-0
> >   45:          5          0   PCI-MSI-edge      eth1
> >   46:  117862901       4414   PCI-MSI-edge      ahci
> >   47:    1543827   99653096   PCI-MSI-edge      eth2-rx-0
> >   48:     209462    4599472   PCI-MSI-edge      eth2-tx-0
> >   49:          6        203   PCI-MSI-edge      eth2
> >   50:      92300  138987795   PCI-MSI-edge      eth3-rx-0
> >   51:     156335  175469555   PCI-MSI-edge      eth3-tx-0
> >   52:       3193        224   PCI-MSI-edge      eth3
> >   53:    3357496          0   PCI-MSI-edge      ha-xover-rx-0
> >   54:    1906359          0   PCI-MSI-edge      ha-xover-tx-0
> >   55:          2          0   PCI-MSI-edge      ha-xover
> 
> Hmm, the lack of irqs is likely to be due to mine running in 32bit mode. I
> looked up the atom part and never saw that it was capable of 64bit, so I
> didn't even try it. That /may/ change things. hrm.

So I've reinstalled with 64bit debian. theres more irqs, but some of the ones 
you suggested earlier don't exist (some do). Setting the affinity didn't 
really help with performance. Now I also have both threads showing, but one 
seems to be constantly stuck at 100% cpu use, and things feel a bit slow.

The stock debian 2.6.32 kernel seems to perform better. the debian 3.2 kernel 
from sid, and this custom 3.6.3 kernel I just compiled both show strangeness.

I can't really explain it.

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-- 
Thomas Fjellstrom
tho...@fjellstrom.ca
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