Date: Tue, 5 Feb 2002 21:38:16 -0800 (PST) From: k Macy <kip_macy@yahoo.com> To: drosih@rpi.edu Cc: current@FreeBSD.ORG Subject: Re: Performance of -current vs -stable Message-ID: <20020206053816.32816.qmail@web14003.mail.yahoo.com> 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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of > the message > > __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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