Date: Thu, 30 Mar 2006 15:58:58 -0500 From: Kris Kennaway <kris@obsecurity.org> To: usleepless@gmail.com Cc: Miguel <mmiranda@123.com.sv>, freebsd-questions@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: terrible performance in 6.1beta4 Message-ID: <20060330205858.GA21147@xor.obsecurity.org> In-Reply-To: <c39ec84c0603301249s68475c2erdb87c49eec157c0@mail.gmail.com> References: <442B2FC6.9040001@123.com.sv> <20060330011834.GA84658@xor.obsecurity.org> <c39ec84c0603300047u5530fc1fjb1ba93fcafcd490d@mail.gmail.com> <442BF0BB.8010504@123.com.sv> <c39ec84c0603301141g42f0f367i1c7669c90e1115d7@mail.gmail.com> <20060330202145.GA17856@xor.obsecurity.org> <c39ec84c0603301249s68475c2erdb87c49eec157c0@mail.gmail.com>
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--lrZ03NoBR/3+SXJZ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Mar 30, 2006 at 10:49:01PM +0200, usleepless@gmail.com wrote: > Kris, >=20 > > Yes, this is my impression of the problem too. Any time your process > > is waiting on disk I/O it is going to perform terribly (on any OS - > > disks are slow), and the way to fix this is to make sure it does as > > little I/O as possible (by allowing everything to be cached in RAM). >=20 > just for my curiosity, do you share my opinion on the fsync issue? Actually I seem to recall that on Linux with default settings fsync() lies and does not actually sync data before returning, so maybe it's worth turning off on FreeBSD too if you're comfortable with the implications of this. Kris --lrZ03NoBR/3+SXJZ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFELEaRWry0BWjoQKURAiBCAKC79U3cKxjWXO0fxaP9IpD9xxEunwCggND9 QtlqUFFqFwgWaOWzngP6Zto= =1Sfk -----END PGP SIGNATURE----- --lrZ03NoBR/3+SXJZ--
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