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Date:      Fri, 22 Oct 2004 14:28:29 -0600
From:      Scott Long <scottl@freebsd.org>
To:        Garance A Drosihn <drosih@rpi.edu>
Cc:        freebsd-current@freebsd.org
Subject:   Re: Annoying SCSI waiting...
Message-ID:  <41796D6D.7000108@freebsd.org>
In-Reply-To: <p06110423bd9f1b6312ed@[128.113.24.47]>
References:  <417960C2.8040007@freebsd.org> <20041022194008.GA23778@odin.ac.hmc.edu> <41796396.5070804@freebsd.org> <p06110423bd9f1b6312ed@[128.113.24.47]>

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Garance A Drosihn wrote:
> At 1:46 PM -0600 10/22/04, Scott Long wrote:
> 
>>
>> This is not just a problem with old disk drives, it's a problem
>> with some cdrom and many tape drives.  Maybe it can be set to 15
>> only if the sa, cd, and/or ch drivers are present.  That still
>> doesn't solve the problem with GENERIC, and I would like to keep
>> GENERIC as compatible as possible.
> 
> 
> One data point:  I have dropped that value to 7 seconds (or less)
> on every FreeBSD system I have ever built, for at least six or
> seven years now.  That goes back to a 60-MHz pentium, iirc (it was
> a mean machine back when it was released, with a price-tag to match.
> That machine is still the most expensive PC I have ever bought!).
> 
> I don't know how low of a value would be safe, but I think we
> could safely pick a value which is less than 15 seconds.
> 

For just about everyone, a value of 2 seconds or less is just fine.
For those with tape drives, changers, and (less likely) cdroms, a
long delay after reset is still quite necessary.  There are two knobs
to adjust this, and I'd like GENERIC to remain compatible.  It's 15
seconds, not 2 minutes.  You get a longer delay that that just trying
to set up the inital page tables on a large memory machine!

Scott



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