kern/79339: [patch] Kernel time code sync with improvements from DragonFly

[Uwe Doering]

The following reply was made to PR kern/79339; it has been noted by GNATS.

From: Uwe Doering <gemini at geminix.org>
To: Joshua Coombs <jcoombs at gwi.net>
Cc: freebsd-bugs at FreeBSD.org
Subject: Re: kern/79339: [patch] Kernel time code sync with improvements 
 from DragonFly
Date: Thu, 31 Mar 2005 08:44:55 +0200

 Joshua Coombs wrote:
 > The following reply was made to PR kern/79339; it has been noted by GNATS.
 > 
 > From: "Joshua Coombs" <jcoombs at gwi.net>
 > To: <freebsd-gnats-submit at FreeBSD.org>,
 > 	"Joshua Coombs" <jcoombs at gwi.net>
 > Cc:  
 > Subject: Re: kern/79339: [patch] Kernel time code sync with improvements from DragonFly
 > Date: Wed, 30 Mar 2005 09:33:59 -0500
 > 
 >  Testing with wakeup_latency.c on a 5.3-Rel box shows the same symptom set. 
 >  I've not yet tested the proposed fix on 5-x.  I will try dupilcating this 
 >  issue on 6-current as well to nail down the problem scope. 
 
 Please also look at what's actually in DragonFly's CVS repository.  Your 
 PR is based on the original patch, while the code in DragonFly is more 
 sophisticated.  Namely, tvtohz() was split into two functions, 
 tvtohz_low() and tvtohz_high(), which replace the original function 
 depending on the context tvtohz() appears in.
 
  From this I conclude that the original patch is insufficient (likely to 
 break parts of the kernel), and that integrating this improvement into 
 FreeBSD might not be as easy and straightforward as it appears to be at 
 first glance.  On the other hand, with some effort it ought to be doable.
 
     Uwe
 -- 
 Uwe Doering         |  EscapeBox - Managed On-Demand UNIX Servers
 gemini at geminix.org  |  http://www.escapebox.net
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