From owner-freebsd-hackers Thu Jun 29 23:10:20 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from hermes.research.kpn.com (hermes.research.kpn.com [139.63.192.8]) by hub.freebsd.org (Postfix) with ESMTP id EB2F437B6A6 for ; Thu, 29 Jun 2000 23:10:17 -0700 (PDT) (envelope-from K.J.Koster@kpn.com) Received: from l04.research.kpn.com (l04.research.kpn.com [139.63.192.204]) by research.kpn.com (PMDF V5.2-31 #42699) with ESMTP id <01JR7GRE7SJ60008QC@research.kpn.com> for hackers@FreeBSD.ORG; Fri, 30 Jun 2000 08:10:15 +0200 Received: by l04.research.kpn.com with Internet Mail Service (5.5.2650.21) id ; Fri, 30 Jun 2000 08:10:15 +0100 Content-return: allowed Date: Fri, 30 Jun 2000 08:10:08 +0100 From: "Koster, K.J." Subject: RE: Funky scheduler stuff under heavy I/O. To: 'Jaye Mathisen' Cc: hackers@FreeBSD.ORG Message-id: <59063B5B4D98D311BC0D0001FA7E4522026D76D5@l04.research.kpn.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-type: text/plain; charset="iso-8859-1" Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > both the Master and Slave drives on the first channel of > each controller are about 200MB's ahead of the master > and slave drives on the second channel of each > controller, and the gap is growing. > Umm. This sounds more like your controllers are doing this. You could stick in another two IDE controllers and see if that cures the problem. You have one of those 10 PCI bus boards, right? :-) Come to think of it, that would still not show if it's the hardware or FreeBSD dropping the bucket. Just curious, but is using vinum actually improving performance? (Assuming that's what you're trying to achieve) I've bonnied two Maxtor DiamondMax 15GB drives in my box, and I found that when I stripe them, performance drops to 15MB/s, whereas a single Maxtor will fling 25MB/s onto the platter. Kees Jan ================================================= TV is the worst of both worlds. It's not as good at words as radio is because the pictures are a distraction which demand attention, and it's not as good as cinema because the pictures are not nearly as good. Douglas Adams To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message