Date: Wed, 2 Apr 2003 11:13:26 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Jason Andresen <jandrese@mitre.org> Cc: FreeBSD Stable List <freebsd-stable@freebsd.org> Subject: Re: vinum performance Message-ID: <20030402014326.GJ34617@wantadilla.lemis.com> In-Reply-To: <3E89A0DE.7040505@mitre.org> References: <20030330125138.K23911@leelou.in.tern> <3E870CC7.5000204@mac.com> <20030330175605.E23911@leelou.in.tern> <3E87204C.5060304@ludd.luth.se> <3E88524A.1060600@mitre.org> <3E88AECD.10607@liwing.de> <3E88B601.90802@mitre.org> <20030401004953.GE34617@wantadilla.lemis.com> <3E89A0DE.7040505@mitre.org>
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--bYB/dvygrOI2NuBf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tuesday, 1 April 2003 at 9:23:26 -0500, Jason Andresen wrote: > Greg 'groggy' Lehey wrote: > >>>>> I get 4565 K/sec on modern ATA/133 HDDs. >>>>> >>>>> Reading is much better at 91908 K/sec at least. >>> >>> Well, I'm writing 200MB files most of the time, so the stripe size is >>> not an issue. I'm just wondering why the reads are *20* times faster >>> than the writes. >> >> >> They're not. I don't know where you get that read figure from, but no >> disk can transfer that fast, and you don't appear to be doing multiple >> transfers in parallel. > > That was what bonnie++ reported. As I've said elsewhere, bonnie++ is not an appropriate benchmark here. >>> I think the read performance was CPU limited in this case. >> >> >> I think you were reading from cache. > > Quite possible. I'm not sure how bonnie handles that. It reads from cache. Greg -- See complete headers for address and phone numbers --bYB/dvygrOI2NuBf Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE+ikA+IubykFB6QiMRAl8nAJ0dsFHLcn8HA9qmShh0TBZe1IPoQgCeMIYJ /h+M6MKLfWNYcZEech9zTeM= =UmVH -----END PGP SIGNATURE----- --bYB/dvygrOI2NuBf--
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