Date: Sun, 13 Apr 2003 22:58:14 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: cbehanna@panasas.com Cc: stable@freebsd.org Subject: Re: PATCH: Forcible delaying of UFS (soft)updates Message-ID: <20030413.225814.45028971.imp@bsdimp.com> In-Reply-To: <200304121548.56524.cbehanna@panasas.com> References: <C1398952884B984C8AB1519CEAC66F940A18DF@OLYMPIC.AD.HartBrothers.Com> <200304121548.56524.cbehanna@panasas.com>
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In message: <200304121548.56524.cbehanna@panasas.com>
Chris BeHanna <cbehanna@panasas.com> writes:
: > Unless, of course, your system or power happens to fail.
: > Imagine you have a database program keeping track of banking
: > transactions. [...]
:
: Then you won't be running that program on a *laptop*, now, will
: you? It'll be in a NOC with hefty power-failover hardware already in
: place.
:
: Can we pretty please keep criticisms of this patch in their proper
: context? Power-saving features for a *laptop* have little or no
: bearing on the behavior of mission-critical back office applications.
Actually, you will. Let's not think laptops are such crappy things
that nothing interesting is going on on them.
I get all my email on my laptop. nmh uses fsync (or did once upon a
time) to make sure that its messages are properly on fixed media
format. There are other programs that I use all the time that do this
too (emacs springs to mind). When I save a file, I damn well want it
on disk, in case the crappy batteries that I have cause me to go down
before the timeout period is over.
So not only is this not a theoretical objection, the laptop that I'm
using right now is a prime example.
Warner
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