From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 8977 invoked from network); 6 Mar 2021 01:18:40 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 6 Mar 2021 01:18:40 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 8C45A9CA9F; Sat, 6 Mar 2021 11:18:39 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id CA07E9CA6D; Sat, 6 Mar 2021 11:18:28 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 42BF69CA6D; Sat, 6 Mar 2021 11:18:27 +1000 (AEST) Received: from lax.lemis.com (www.lemis.com [45.32.70.18]) by minnie.tuhs.org (Postfix) with ESMTP id 88B799CA6B for ; Sat, 6 Mar 2021 11:18:26 +1000 (AEST) Received: from eureka.lemis.com (unknown [121.200.11.253]) by lax.lemis.com (Postfix) with ESMTP id 4C806281A8; Sat, 6 Mar 2021 01:18:26 +0000 (UTC) Received: by eureka.lemis.com (Postfix, from userid 1004) id 6DD2E2635BE; Sat, 6 Mar 2021 12:18:25 +1100 (AEDT) Date: Sat, 6 Mar 2021 12:18:25 +1100 From: Greg 'groggy' Lehey To: Theodore Ts'o Message-ID: <20210306011824.GB80491@eureka.lemis.com> References: <20210304212459.GA6303@eureka.lemis.com> <20210304212917.GB6303@eureka.lemis.com> <25189.1614937832@hop.toad.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="dTy3Mrz/UPE2dbVg" Content-Disposition: inline In-Reply-To: Organization: LEMIS, 29 Stones Road, Dereel, VIC, Australia Phone: +61-3-5309-0418 Mobile: +61-490-494-038. Use only as instructed. WWW-Home-Page: http://www.lemis.com/grog X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 User-Agent: Mutt/1.6.1 (2016-04-27) Subject: Re: [TUHS] tunefs -m 5% X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --dTy3Mrz/UPE2dbVg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Friday, 5 March 2021 at 10:32:15 -0500, Theodore Ts'o wrote: > On Fri, Mar 05, 2021 at 01:50:32AM -0800, John Gilmore wrote: >> John P. Linderman wrote: >>> I have several 12 TB disks scattered about my house. 5% of 12TB is 600GB. >> >> At one point in hystery, ext2 performance was reported to suffer badly >> if there was less than 5% of disk space available in an active >> filesystem. My naive belief, probably informed by older and wiser heads >> around Sun, was that when the file system was >95% full, ext2 spent a >> lot of time seeking around in free lists finding single allocatable >> blocks. And there were no built-in "defragmentation" programs that >> could easily fix that. > > I'll point out that BSD FFS, at least in BSD 4.3, reserves 10% of the > file system for reserved blocks. Oops, that's what I get for reading messages sequentially :-( But in this case it's for small values of 10. Greg -- Sent from my desktop computer. Finger grog@lemis.com for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA --dTy3Mrz/UPE2dbVg Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAmBC2GAACgkQIubykFB6QiOgKgCgo+ZIUdBLttGniqReSI2uu9/V FWMAoLUQMqXfCB+QBdAJ0Sn8UbAS6vT3 =RG26 -----END PGP SIGNATURE----- --dTy3Mrz/UPE2dbVg--