fixing IRQ storms (sort of solved)

[Mike Tancsa]

At 04:47 PM 4/5/2007, Mike Tancsa wrote:

>Using
>http://lists.freebsd.org/pipermail/freebsd-bugs/2007-March/022753.html
>
>I have been able to get my GPRS card to be recognized in 
>FreeBSD.  However, the IRQ it has picked, seems to conflict with the 
>irq of the cardbus causing an interrupt storm.  Is there a way to 
>make the card use a different IRQ ?  I tried ORing in 
>PCCARD_CFE_IRQSHARE, but it doesnt seem to make a difference.


Just to followup on this thread in case others run into this 
problem.  The card is "working" with the uart driver, but I am still 
getting an initial interrupt storm at boot up....


...from a boot -v snippet


Elan-mmcr driver: MMCR at 0xc5b53000.
Elan-mmcr Soekris net45xx comBIOS ver. 1.28 20050527 Copyright (C) 2000-2005
pflog0: bpf attached
lo0: bpf attached
pccard0: using CIS quirks for Sierra Wireless, AC860, 3G Network Adapter, R1
pccard0: CIS version PC Card Standard 7.0
pccard0: CIS info: Sierra Wireless, AC860, 3G Network Adapter, R1
pccard0: Manufacturer code 0x192, product 0x710
pccard0: function 1: serial port, ccr addr 700 mask 73
pccard0: function 1, config table entry 34: I/O card; irq mask 3fbc; 
iomask 0, iospace 3e8-3ef; io8 irqlevel
uart4: <Sierra Wireless AC860> at port 0x3e8-0x3ef irq 10 function 1 
config 34 on pccard0
Interrupt storm detected on "irq10:"; throttling interrupt source
ata0-master: pio=PIO4 wdma=WDMA2 udma=UNSUPPORTED cable=40 wire
ad0: 991MB <ELITE PRO CF CARD 1GB 20070205> at ata0-master PIO4
ad0: 2030112 sectors [2014C/16H/63S] 1 sectors/interrupt 1 depth queue


And looking at vmstat -i

[datawest-soekris]# vmstat -i ;sleep 1;vmstat -i
interrupt                          total       rate
irq0: clk                         137079        993
irq4: uart0                          502          3
irq8: rtc                          17544        127
irq10: cbb0 uart4                 128357        930
irq11: sis0                           29          0
irq14: ata0                        16188        117
Total                             299699       2171
interrupt                          total       rate
irq0: clk                         138212        994
irq4: uart0                          529          3
irq8: rtc                          17689        127
irq10: cbb0 uart4                 129477        931
irq11: sis0                           29          0
irq14: ata0                        16200        116
Total                             302136       2173

Over 1,110 interrupts in one second and it will just continue that 
way forever..... Yet, if I then attach to the modem, all becomes OK 
after that ?!?!

# cu -l /dev/cuau4
Connected
ati3
Manufacturer: Sierra Wireless, Inc.
Model: AC860
Revision: U1_2_40ACAP G:/WS/FW/U1_2_40ACAP/MSM6275/SRC 2006/09/11 17:50:27
IMEI: 357806001674042
IMEI SV: 17
FSN: X171696267512
3GPP Release 5
+GCAP: +CGSM,+FCLASS,+DS
2007/04/19
09:57:29


OK

# vmstat -i ; sleep 1 ; vmstat -i
interrupt                          total       rate
irq0: clk                         252979        995
irq4: uart0                          718          2
irq8: rtc                          32377        127
irq10: cbb0 uart4                 225905        889
irq11: sis0                           86          0
irq14: ata0                        16392         64
Total                             528457       2080
interrupt                          total       rate
irq0: clk                         254064        996
irq4: uart0                          745          2
irq8: rtc                          32516        127
irq10: cbb0 uart4                 225905        885
irq11: sis0                           86          0
irq14: ata0                        16392         64
Total                             529708       2077


I also confirmed that if I set hw.intr_storm_threshold=0 in the 
/boot/loader.conf, the Soekris does indeed lockup after displaying 
the uart4 on the console.


         ---Mike