Date: Fri, 14 May 2004 14:01:57 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Roman Kurakin <rik@cronyx.ru> Cc: freebsd-current@freebsd.org Subject: Re: but withoutI WITNESS and INVARIANTS ? Message-ID: <20040514210157.GA96254@xor.obsecurity.org> In-Reply-To: <40A4CCB1.8010700@cronyx.ru> References: <40A3F1D5.5010209@bellsouth.net> <20040514155152.4d6dee6b@it.buh.cameradicommercio.ro> <40A4CCB1.8010700@cronyx.ru>
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--gKMricLos+KVdGMg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, May 14, 2004 at 05:42:09PM +0400, Roman Kurakin wrote: > The possibility that by disabling this debug stuff you will get some=20 > instability is > very very .... very low :-) > By turning them off you will get improved performance. > By the way they are dissabled by default on every release. Not so low..it changes the timings of operations, which can expose race conditions. One of my SMP machines locks up every couple of days(nothing on console, does not respond to DDB) when WITNESS and INVARIANTS are disabled, or when they are enabled but WITNESS_SKIPSPIN is enabled. Since I turned off WITNESS_SKIPSPIN a few weeks ago the system has been stable (although very slow). :-( Kris --gKMricLos+KVdGMg Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFApTPFWry0BWjoQKURAr+OAJ9iIohCra89IQ8VAUiXTfKVTc1O1QCfe+cw hfIw4ke0R8Mto/EeU3CQVe4= =2ap8 -----END PGP SIGNATURE----- --gKMricLos+KVdGMg--
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