ucom/uftdi high interrupt load
spork at bway.net
Thu Jun 16 06:58:05 UTC 2011
On Thu, 16 Jun 2011, Hans Petter Selasky wrote:
> On Thursday 16 June 2011 02:01:03 Charles Sprickman wrote:
>> On Tue, 14 Jun 2011, Hans Petter Selasky wrote:
>>> On Tuesday 14 June 2011 02:58:44 Charles Sprickman wrote:
>>>> On Mon, 13 Jun 2011, Hans Petter Selasky wrote:
>>>>> On Sunday 12 June 2011 23:50:24 Charles Sprickman wrote:
>>>>>> On Sun, 12 Jun 2011, Hans Petter Selasky wrote:
>>>>>>> On Saturday 11 June 2011 23:43:11 Charles Sprickman wrote:
>>>>> Ok, then those quirks won't help.
>>>>> For OHCI, I guess you should check vmstat -i.
>>>> Oddly enough, the box paniced today, but it appeared to be related to
>>>> fxp. However in the coredump summary, I have "vmstat -i" output, and
>>>> ohci seems fairly high in comparison to everything else:
>>>> vmstat -i
>>>> interrupt total rate
>>>> irq4: uart0 106 0
>>>> irq10: ohci0 142322001 968176
>>>> irq14: ata0 1178 8
>>>> irq20: fxp0 3008691 20467
>>>> irq21: fxp1 1733357 11791
>>>> irq28: sym1 30 0
>>>> irq29: sym0 2624749 17855
>>>> cpu0: timer 728063100 4952810
>>>> cpu1: timer 728044684 4952684
>>>> Total 1605797896 10923795
>>>> Also, just a brief summary of the panic, since it mentions the interrupt
>>>> process again:
>>> The OHCI IRQ rate is too high. It should never exceed 1000 IRQ/s. Maybe
>>> you can build a kernel with "options USB_DEBUG", then run the following
>>> command and post some of the resulting dmesg:
>>> sysctl hw.usb.ohci.debug=16 ; sleep 1; sysctl hw.usb.ohci.debug=0
>> Thanks again... I just booted a kernel with USB_DEBUG and turned the
>> sysctl on for a bit. Was quite hard to turn it off though, but it also
>> looks like time went backward on the machine, so maybe "sleep" never
>> caught up with itself. The output is pretty long, so I posted it here:
>> http://pastebin.com/HdnBYk6k (set to never expire)
>> Another interesting note. On boot, conserver failed to start for no
>> reason I could find. When I initially ran "vmstat -i" before manually
>> starting conserver, the interrupt rate for ohci was much lower, maybe 30/S
>> or so. Starting conserver brought it up to 200-300/S. Conserver was
>> running during the debug logging.
>> Also a full dmesg is here:
> The logs look OK. Are you using suspend/resume on this machine?
Nope. It's an old 1U server that we just use for utility tasks such as
the console server.
I can tell you that during the debug, the box was nearly locked up.
Could something unusual be happening just due to the sheer number of USB
to serial adapters involved? There's 16 on one box, 8 on another. In
total, I think 20 are actually in use.
Any other information I can provide?
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