[Xen-devel] Question Also regarding interrupt balancing

[harish <mvharish@xxxxxxxxx>]

Hi,
Was doing some netperf tests and noticed that all the interrupts (for
network) were being serviced by pcp0 although dom0 was configured to
use all the pcpus [4vcpus]. 
Questions:
1) Is there a way dom0 can be configured to process the interrupts using 4pcpus instead of just one?
2) What is the recommended scheduling policy for a network I/O intensive workload?

Sample output:

cat /proc/xen/interrupts

 cat /proc/interrupts
          
CPU0      
CPU1      
CPU2       CPU3
  1:         
8         
0         
0         
0        Phys-irq  i8042
  8:         
1         
0         
0         
0        Phys-irq  rtc
  9:         
0         
0         
0         
0        Phys-irq  acpi
 11:         
0         
0         
0         
0        Phys-irq  ohci_hcd:usb1
 12:       
105         
0         
0         
0        Phys-irq  i8042
 14:    
302432         
0         
0         
0        Phys-irq  ide0
 16:       
375         
0         
0         
0        Phys-irq  aic7xxx
 17:     
34719         
0         
0         
0        Phys-irq  cciss0
 18:     
53158         
0         
0         
0        Phys-irq  eth0
 19:         
2         
0         
0         
0        Phys-irq  peth1
 20:   
1062076         
0         
0         
0        Phys-irq 
peth2   <<< --------Was using this 
 21:     
25189         
0         
0         
0        Phys-irq  peth3
 22:     
18846         
0         
0         
0        Phys-irq  peth4
 23:     
18682         
0         
0         
0        Phys-irq  eth5
256:   
1456444         
0         
0         
0     Dynamic-irq  timer0
257:     
52873         
0         
0         
0     Dynamic-irq  resched0
258:       
282         
0         
0         
0     Dynamic-irq  callfunc0
259:         
0      
7935         
0         
0     Dynamic-irq  resched1
260:         
0     
33665         
0         
0     Dynamic-irq  callfunc1
261:         
0    
508258         
0         
0     Dynamic-irq  timer1
262:         
0         
0      
3827         
0     Dynamic-irq  resched2
263:         
0         
0     
33835         
0     Dynamic-irq  callfunc2
264:         
0         
0    
390316         
0     Dynamic-irq  timer2
265:         
0         
0         
0      43953    
Dynamic-irq  resched3
266:         
0         
0         
0      33870    
Dynamic-irq  callfunc3
267:         
0         
0         
0     311447    
Dynamic-irq  timer3
268:      
5091         
0         
0         
0     Dynamic-irq  xenbus
269:         
0         
0         
0         
0     Dynamic-irq  console
270:     
31532         
0         
0         
0     Dynamic-irq  blkif-backend
271:   
1107498         
0         
0         
0     Dynamic-irq  vif7.0
NMI:         
0         
0         
0          0
LOC:         
0         
0         
0          0
ERR:          0
MIS:          0

Ran multiple while loops to confirm that dom0 can use all the 4pcpus if
required. And so believe it must be something to do with the way the
interrupts are being handled.

Thanks in advance,
hmv

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