Date: Tue, 28 Jun 2005 15:16:06 +0200 From: Martin Nilsson <martin@gneto.com> To: Michael Schuh <michael.schuh@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD MySQL still WAY slower than Linux Message-ID: <42C14D96.9020605@gneto.com> In-Reply-To: <1dbad31505062805472d4c6e0a@mail.gmail.com> References: <1dbad315050621051525f4c6fc@mail.gmail.com> <200506281904.48464.doconnor@gsoft.com.au> <20050628111332.GC48140@isis.sigpipe.cz> <200506282105.20586.doconnor@gsoft.com.au> <1dbad31505062805472d4c6e0a@mail.gmail.com>
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Michael Schuh wrote: > # cd /; /usr/bin/time dd if=/dev/zero bs=1024 count=1024k of=zerofile; > I would only compare the performace from 2 Versions of FreeBSD, while > i mean that the performance from RELENG_5 is more slower than under > GENTOO and it is double as slow as under RELENG_4. Let me guess: Intel ICH5 or 6300ESB south bridge and ATA disk (Seagate Barracuda 7200.7)? There is something wrong in the RELENG_5 ATA driver that makes this combination perform really slow on writes (~16MB/s). When connecting a nearly identical SATA drive to the machine it performs as expected with ~55MB/s sequential writes. RELENG_4 performs as expected and I think ATA mkIII in CURRENT also works. /Martin
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