svn commit: r195960 - in head/sys/dev/usb: . controller input

Scott Long scottl at
Sat Aug 1 02:58:50 UTC 2009

Dmitry Marakasov wrote:
> * Navdeep Parhar (nparhar at wrote:
>> This has slowed down core dumps very significantly.  What used to take 10-15s on
>> my system now takes around 3 minutes.
> Same here.

Likely because prior to polling being implemented, each i/o was done 
blindly and completed immediately instead of waiting for actual
confirmation from the hardware.  Crashdumps have been slow for a
number of years, thanks to a fundamental change in how they are done.
Until now, USB was cheating and making them look fast.


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