Hello Tejun,
Tejun Heo wrote:
> On 07/05/2010 10:26 AM, Heiko Schocher wrote:
>> IRQ 26: too many spurious IRQs, disabling and polling for 10k 10msec intervals.
>> IRQ 26: system performance may be affected
>> handlers:
>> [<c0198d00>] (ata_sff_interrupt+0x0/0x204)
>
> Yeah, that's the new polling code kicking in. If the IRQ problem
> doesn't persiste (which should be the case here), polling will step
> down after a while and everything will return to normal. If you keep
> the system running more than ten minutes and use the CF device, does
> the kernel complain anymore?
No, I can use the CF while kernel is in polling mode, also if the
kernel switched back to irq mode:
Log, direct after kernel is up:
[...]
Freeing unused kernel memory: 132k init
-bash-3.2# mount -t vfat /dev/sdb1 /home/hs/mnt
-bash-3.2# cat /proc/uptime
62.08 14.08
-bash-3.2# cat /proc/interrupts
CPU0
17: 0 CPM PIC Level error
18: 0 MPC8XX SIU Level tbint
19: 308 CPM PIC Level cpm_uart
21: 4 CPM PIC Level mpc8xxx_spi
22: 0 MPC8XX SIU Edge ads7846
23: 20043 MPC8XX SIU Level fs_enet-mac
24: 0 MPC8XX SIU Level m8xx-pcmcia
25: 9 MPC8XX SIU Level pata_pcmcia
26: 10000 MPC8XX SIU Level pata_pcmcia
27: 129 CPM PIC Level cpm_i2c
LOC: 6408 Local timer interrupts
SPU: 0 Spurious interrupts
CNT: 0 Performance monitoring interrupts
MCE: 0 Machine check exceptions
-bash-3.2#
No irq is used.
-bash-3.2# dmesg
[...]
Freeing unused kernel memory: 132k init
IRQ 26: spurious polling finished, reenabling IRQ
-bash-3.2#
Now it is back in irq mode:
-bash-3.2# cat /proc/uptime
419.65 370.56
-bash-3.2#
-bash-3.2# mount -t vfat /dev/sdb1 /home/hs/mnt
-bash-3.2# cat /proc/interrupts
CPU0
17: 0 CPM PIC Level error
18: 0 MPC8XX SIU Level tbint
19: 956 CPM PIC Level cpm_uart
21: 4 CPM PIC Level mpc8xxx_spi
22: 0 MPC8XX SIU Edge ads7846
23: 20414 MPC8XX SIU Level fs_enet-mac
24: 0 MPC8XX SIU Level m8xx-pcmcia
25: 9 MPC8XX SIU Level pata_pcmcia
26: 10033 MPC8XX SIU Level pata_pcmcia
27: 129 CPM PIC Level cpm_i2c
LOC: 10880 Local timer interrupts
SPU: 0 Spurious interrupts
CNT: 0 Performance monitoring interrupts
MCE: 0 Machine check exceptions
-bash-3.2#
Now it uses the irq ...
bye,
Heiko
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