On Wed, 26 Apr 2006, Christian Haul wrote:

> Alan Stern wrote:
> > It's hard to account for where the time was spent from the ps listing.  
> > It would help if you could provide another dmesg log with
> > CONFIG_PRINTK_TIME set.
> 
> Here you go
> 
> [  388.331103] usb-storage: *** thread sleeping.
> [  388.335390] usb-storage: queuecommand called
> [  388.335403] usb-storage: *** thread awakened.
...
> [  388.356047] usb-storage: *** thread sleeping.

I was hoping to see more than one cycle of this.  Although I could do a
more detailed timing analysis, the thing that jumps out here is that the
polls occur a lot more frequently than once every 2 seconds.  In fact, the
interval appears to be 25 ms!  That's the time between the initial "thread
sleeping" -- which actually marks the end of the preceding poll -- and
the final one.

Seeing more of the log might explain what's really happening.

Alan Stern



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