From owner-freebsd-stable Sun Apr 4 22:39:41 1999 Delivered-To: freebsd-stable@freebsd.org Received: from relay.rinet.ru (relay.rinet.ru [195.54.192.35]) by hub.freebsd.org (Postfix) with ESMTP id 57542153C6 for ; Sun, 4 Apr 1999 22:39:30 -0700 (PDT) (envelope-from ilya@zhurnal.ru) Received: from webmaster (webmaster.zhurnal.ru [195.91.166.206]) by relay.rinet.ru (8.9.3/8.9.3) with SMTP id JAA24949 for ; Mon, 5 Apr 1999 09:37:33 +0400 (MSD) Date: Mon, 5 Apr 1999 09:36:09 +0400 From: Ilya Obshadko X-Mailer: The Bat! (v1.22) S/N 6F69626F Reply-To: Ilya Obshadko Organization: Zhurnal.RU X-Priority: 3 (Normal) Message-ID: <5400.990405@zhurnal.ru> To: freebsd-stable@freebsd.org Subject: Poor SMP performance Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hello, Few days ago I wrote to mysql mail list about poor performance on FreeBSD/SMP (Dual P-II 333, UW SCSI, 256M). Here is the answer I got: > The problem is related to SMP in FreeBSD. Because a database > server is I/O bound, and FreeBSD's SMP implementation does a giant > i/o lock around the kernel for each processor, it actually > is SLOWER to run MySQL on a dual processor FreeBSD machine than > on a single processor. I ran into the same problem -- had just > bought a dual pII 350, which then became my workstation machine > when MySQL ran slowly on it. > > The GOOD NEWS is that, on a single processor 450MHZ machine, I found > FreeBSD MySQL to run significantly FASTER than the benchmarks for any Linux > box, including dual PIIs. Any comments about it? Best regards, Ilya mailto:ilya@zhurnal.ru To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message