Date: Mon, 20 Aug 2001 13:22:18 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Jeff Behl <jeff@expertcity.com> Cc: freebsd-fs@freebsd.org Subject: Re: syncer delay? Message-ID: <20010820132218.B3802@xor.obsecurity.org> In-Reply-To: <3B8143F6.4030908@expertcity.com>; from jeff@expertcity.com on Mon, Aug 20, 2001 at 10:08:06AM -0700 References: <3B8143F6.4030908@expertcity.com>
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--Bn2rw/3z4jIqBvZU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Mon, Aug 20, 2001 at 10:08:06AM -0700, Jeff Behl wrote: > howdy, > We have a very time sensitive application that we think is being > affected by the kernel syncer process. While doing a poll call, every > 30 seconds we will have iterations that take 300+ ms longer than on average. This > only started happening after our app started needing to log data to > disk, and the delays are longer when there are more connections (more to > write/log). Don't do that? The syncer needs to do work to flush stuff to disk, you may be able to reduce that impact but it's still going to be taking runtime away from your application. Kris --Bn2rw/3z4jIqBvZU Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE7gXF5Wry0BWjoQKURAqlcAKDJOnPEoUMzjQlP6BtXo/qFO+cksgCg11IL fMNLUnVX8nFGggFvU+3O6WA= =9AkV -----END PGP SIGNATURE----- --Bn2rw/3z4jIqBvZU-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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