From owner-freebsd-current  Tue Feb  5 21:38:20 2002
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Date: Tue, 5 Feb 2002 21:38:16 -0800 (PST)
From: k Macy <kip_macy@yahoo.com>
Subject: Re: Performance of -current vs -stable
To: drosih@rpi.edu
Cc: current@FreeBSD.ORG
In-Reply-To: <20020205.221805.35979979.imp@village.org>
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I asked BDE about the same thing off-list:
Yes, the debug options (INVARIANTS and WITNESS,
especially the latter)
slow down the kernel by a factor of 10 or so.  Only
progams that don't
make many syscalls run reasonably fast.  I only turn
on these options
for debugging (not often).  Without them, syscalls
should be an average
of only (sigh) about 10% slower in -current.

--- "M. Warner Losh" <imp@village.org> wrote:
> In message: <p05101401b88638b62611@[128.113.24.47]>
>             Garance A Drosihn <drosih@rpi.edu>
> writes:
> : Could it be due to the DDB, INVARIANTS & WITNESS
> options in the
> : kernel?  If it is that's fine with me, I'm just
> wondering where
> : that magnitude of a slowdown would be coming from.
> 
> No way for DDB, Maybe for Invariants, almost
> certainly for witness.
> WITNESS is slow and tends to exagerate lock
> contention stalls (or so
> it seems).
> 
> Warner
> 
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