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Re: High interrupt when using 'dd' with Xen DOM0 kernel
>> Hello,
>>
>> I upgraded from a quite old (november) NetBSD 4.99 i386 to NetBSD 5
>> amd64. (with latest XEN33 packages)
>
> were you using xen33 or xen31 before ?
It was 3.3.0
>> I tried dd if=/dev/zero of=DomU.img bs=1m count=10240 to make a new
>> image to create a domU
>> but this make interrupt to go to 97%
>> CPU states: 1.0% user, 0.0% nice, 0.0% system, 97.1% interrupt, 2.0% idle
>> 0 root 126 0 0K 12M pgdaemon 5:36 76.07% 76.07% [system]
>
> please try
> systat vm
> to see which interrupt rate is high ?
it seems that the highest int. comes from ioapic0 pin 20
# dmesg | grep ioapi | grep 20
ioapic0 at mainbus0 apid 2: pa 0xfec00000, virtual wire mode, version
20, 24 pins
ioapic0: pin 20 attached to pci3 device 0 INT_A (type 0<type=0> flags
f<pol=3=Act Lo,trig=3=Level>)
ioapic0: pin 20 attached to pci3 device 1 INT_D (type 0<type=0> flags
f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int20 1a9d8<vector=d8,delmode=1,logical,actlo,level,masked,dest=0>
1000000<target=1>
satalink0: using ioapic0 pin 20, event channel 9 for native-PCI interrupt
satalink0 at pci3 dev 0 function 0
tlp0 at pci3 dev 1 function 0: Lite-On 82C169 Ethernet, pass 2.0
I guess that it's INT_D and not INT_A (I don't know if there is a way
to see that as sysstat only report pin number).
Only wd0 is connected to satalink0, so I tried on another harddrive
and did not get the same problem.
2 users Load 1.45 0.43 0.16 Sat May 2 21:54:46
Proc:r d s w Csw Trp Sys Int Sof Flt PAGING SWAPPING
2 12 40 13 453 15 1 in out in out
ops
1.0% Sy 0.0% Us 0.0% Ni 98.6% In 0.4% Id pages
| | | | | | | | | | |
=%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% forks
fkppw
memory totals (in kB) 453 Interrupts fksvm
real virtual free ioapic0 pin 16 pwait
Active 298548 298548 662844 ioapic0 pin 23 relck
All 338576 338576 2759952 1 ioapic0 pin 19 rlkok
348 ioapic0 pin 20 noram
Namei Sys-cache Proc-cache vcpu0 ioapic0 ndcpy
Calls hits % hits % 104 vcpu0 clock fltcp
45 44 98 vcpu0 xenbus zfod
cow
Disks: seeks xfers bytes %busy 256 fmin
wd0 44 2788K 100 341 ftarg
sd0 itarg
sd1 1734 wired
sd2 pdfre
sd3 pdscn
cd0
wd1
wd2
wd3
wd4
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