Date: Tue, 1 Jan 2008 23:08:32 -0500 From: "Josh Carroll" <josh.carroll@gmail.com> To: "Ivan Voras" <ivoras@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: mysql scaling questions Message-ID: <8cb6106e0801012008q18830aebp906ebfeb3c519e5a@mail.gmail.com> In-Reply-To: <flb6bp$8kq$1@ger.gmane.org> References: <20071201205609.GA54238@harmless.hu> <20071204130810.GA77186@harmless.hu> <47779AA7.2060801@FreeBSD.org> <20071230132451.GA61295@harmless.hu> <47779EBC.5020900@FreeBSD.org> <20071230134354.GA63555@harmless.hu> <4777A65C.8020406@FreeBSD.org> <20071230141118.GA67574@harmless.hu> <4777AB9C.1010003@FreeBSD.org> <flb6bp$8kq$1@ger.gmane.org>
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> Does anyone have a theory why syscalls are so expensive in FreeBSD? Here
> are the results of unixbench 4.1 on two machines. First is the machine
> running FreeBSD HEAD (debugging disabled) on a dual-core Athlon 64 (i386
> mode), 2 GHz:
I ran the syscall benchmark from UnixBench on the same hardware (Intel
Q6600 @ 3.2 GHz) for both FreeBSD 7.0-RC1 (amd64) and Knoppix 5.1
(Linux 2.6.9 PREEMPT kernel, i386).
Per the comments in this thread, i386 syscalls should be less
expensive than amd64 syscalls, so the results are interesting:
FreeBSD 7.0-RC1 (amd64): System Call Overhead
15000.0 1103233.7 735.5
Knoppix Linux 2.6.9 (i686): System Call Overhead
15000.0 1108869.7 739.2
I can try to find a Linux live CD with a 2.6.x x86-64 kernel for a
valid apples-to-apples comparison, but thought these results might
provide some parity/insight.
Doesn't look like the syscalls are slower at all on FreeBSD.
Josh
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