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xen-devel
Re: [Xen-devel] Question Also regarding interrupt balancing
On 22 May 2006, at 17:43, harish wrote:
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?
Running irqbalance daemon in dom0 should do the trick. If there's no
other load in domain0 though, irqbalance may decide not to change irq
affinity. There's no way to do fine-grained interrupt balancing (e.g.,
round-robin interrupts).
2) What is the recommended scheduling policy for a network I/O
intensive workload?
If delivering to a domU, you want dom0 and domU running on different
CPUs or CPU will be the bottleneck.
-- Keir
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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