Date: Sun, 22 Aug 2004 18:18:35 -0000 From: "Julien Lavigne du Cadet" <jlavigne@kaalys.com> To: <stable@freebsd.org> Subject: I/0 issue on a poweredge 750 wit sata raid 1. Message-ID: <004301c2e9ef$6e810540$0d00a8c0@Julionportable>
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Hi eveybody, =20 I've been using Freebsd 4.x for more than 6 months now, with a very = common system (P4 2,4 - 1Go ram - ide hdd). As I've been very pleased = with this OS, I'd like to use it with one of our new server, a dell = poweredge 750, P4 3,2 - 1Go ram - 2 sata drives on a raid 1 array. =20 So I installed Freebsd 4.10 on it, and everything went well during the = install. But I started a few tests (this machine is supposed to be a web = server), and I've been very disappointed by the I/0 performances. In = fact, the same query on the same database takes 2,56s on my old P4 = (which supports about 300 persons on a vbulletin forum at the same = time), and 4,80s on the new dell. Of course, the mysql configuration is = the same, and I've launched the query a few time to avoid differences = due to mysql cache. Moreover, the new server has been partitioned following the FreeBSD = standards, and softupdate is on whereas the old server doesn't have it. =20 My guess is that it's related to raid and/or sata support on FreeBSD = 4.10 but I was not able to find much about it on google. The only thing = interesting, was on the aac man page, which recommends to add a var to = loader.conf for maximum performances (what I've done but it didn't make = a difference). =20 I didn't make any tuning of things like that. The only thing that's I've = done is to build a new kernel with CPU_ENABLE_SSE and without I386_CPU, = I486_CPU, I586_CPU. =20 Any advice would be greatly appreciated, Best regards, Julien Lavigne du Cadet.=20
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