Re: Interrupt Assignment on host

[Avi Kivity <avi@redhat.com>]

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On 11/05/2009 09:09 PM, Erik Rull wrote:
>> Can you describe how performance suffers?
>>
>> Please provide vmstat (for host int/sec) and "kvm_stat  -l -f 
>> 'exits|irq_exits'" output.
>>
>
>
> I'm sorry, but my target system has no python installed. Any ideas how 
> to do that manually?

Try the attached bash script.  You'll want debugfs mounted on 
/sys/kernel/debug.

-- 
error compiling committee.c: too many arguments to function


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#!/bin/bash

p="/sys/kernel/debug/kvm"

old_exits=0
old_irq_exits=0

while :; do
    exits="$(cat "$p/exits")"
    irq_exits="$(cat "$p/irq_exits")"
    d_exits=$((exits - old_exits))
    d_irq_exits=$((irq_exits - old_irq_exits))
    printf "%10d %10d\n" "$d_exits" "$d_irq_exits"
    sleep 1
    old_exits="$exits"
    old_irq_exits="$irq_exits"
done