High Interrupt rate since r279961 on STABLE/10 branch

[Adrian Chadd]

Hi,

There was an update to freebsd-head a few days ago from hans - it
disabled PCI interrupts for VGA until a driver claims it.

See if that helps?


-a
b

On 10 June 2015 at 05:33, Yanhui Shen <shen.elf at gmail.com> wrote:
> Hi,
>
> I noticed the interrupt rate of my FreeBSD system is very high (~35%) after
> upgrade from r279138 to r284205.
>
> To find out which revision cause this problem,
> I used a  binary search manner and compiled the kernel 11 times.
> Finally I located to r279961, the interruption rate is abnormal since this
> revision.
>
> Do you have any idea about this issue?
>
> ( I'm temporarily using r279958 kernel with r284205 base system, everything
> is fine.)
>
> --------------------------------
>
> Device: ThinkPad R400 (Product ID: 278225C)
> CPU: Intel Core 2 Duo processor T6570 (2.1 GHz)
> GPU: Intel Integrated Graphics 4500MHD
>
> Output of "vmstat -i" with r284205 kernel (abnormal):
> interrupt                    total              rate
> irq1: atkbd0              1607             1
> irq9: acpi0                 131958         104
> irq12: psm0               4281            3
> irq16: uhci3               239899376  189643
> irq20: hpet0 uhci0     1426118      1127
> irq21: uhci1               40315          31
> irq23: ehci0               33                0
> irq256: vgapci0          6059           4
> irq257: em0               49220         38
> irq258: hdac0            62                0
> irq260: ahci0:ch0       17217          13
> irq261: ahci0:ch1       23               0
> Total                          241576269  190969
>
> Output of "vmstat -i" with r279958 kernel (normal):
> interrupt                          total       rate
> irq1: atkbd0                       48155          3
> irq9: acpi0                      1581468        105
> irq12: psm0                       209484         13
> irq19: ehci1                       48099          3
> irq20: hpet0 uhci0              17385585       1156
> irq21: uhci1                      680884         45
> irq23: ehci0                          31          0
> irq256: vgapci0                  2611430        173
> irq257: em0                      1342009         89
> irq258: hdac0                     602220         40
> irq260: ahci0:ch0                 236313         15
> irq261: ahci0:ch1                     27          0
> Total                           24745705       1646
>
> The revision:
> https://svnweb.freebsd.org/base?view=revision&revision=279961
>
> --------------------------------
>
> Best regards,
> Yanhui Shen
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