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Date: Fri, 31 Jul 2009 20:58:47 -0600
From: Scott Long <scottl@samsco.org>
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To: Dmitry Marakasov <amdmi3@amdmi3.ru>
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	Alfred Perlstein <alfred@FreeBSD.org>,
	Navdeep Parhar <nparhar@gmail.com>, src-committers@FreeBSD.org
Subject: Re: svn commit: r195960 - in head/sys/dev/usb: . controller input
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Dmitry Marakasov wrote:
> * Navdeep Parhar (nparhar@gmail.com) 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.

Scott