Date: Thu, 21 Dec 2006 23:03:48 +1300 From: Mark Kirkwood <markir@paradise.net.nz> To: JoaoBR <joao@matik.com.br> Cc: "O. Hartmann" <ohartman@zedat.fu-berlin.de>, freebsd-stable@freebsd.org Subject: Re: Cached file read performance with 6.2-PRERELEASE Message-ID: <458A5C04.9060109@paradise.net.nz> In-Reply-To: <200612210631.31088.joao@matik.com.br> References: <45888C68.10305@paradise.net.nz> <200612200816.51043.joao@matik.com.br> <4589128F.9030404@paradise.net.nz> <200612210631.31088.joao@matik.com.br>
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JoaoBR wrote:
>
> I am not convinced that this kind of test is of any value for comparing
> systems at all because there are too much factors involved - unless the
> competitors are installed on identical hardware. On the other side I think it
> is usefull to compare tweaked settings on a particular machine. For example
> you may change fsize/bsize of the filesystem or any other and can compare
> this results then.
>
Exactly, that's why I did the comparison - I think you missed the part
where I mentioned the 2 systems were *identical* with respect to cpus,
memory, mobo - in fact even the power supplies are identical too! the
only differences are that the Gentoo system has a different RAID
controller from the FreeBSD one (a cheaper one in fact), and the FreeBSD
system has larger capacity disks (slightly newer variants, same brand!)
given this comparison is about *cached* read rates, the RAID controllers
and disks are not significant I think.
Specifically:
Gentoo :
- Supermicro P3TDER
- 2xSL5QL 1.26 GHz PIII
- 2xKingston PC133 RCC Registered 1GB DIMMS
- Promise TX4000 4x Maxtor plus 8 ATA-133 7200 40G
FreeBSD
- Supermicro P3TDER
- 2xSL5QL 1.26 GHz PIII
- 2xKingston PC133 RCC Registered 1GB DIMM
- 3Ware 7506 4x Maxtor Plus 9 ATA-133 7200 80G
In fact, to indulge your skepticism ('cause I think this is a real issue
worth sorting out), I booted the FreeBSD system with a Gentoo livecd
and ran the same tests there... and guess what - identical results to
the installed Gentoo system...so... errm - *my* experimental method is
sound...so how about we just get together and see how to make FreeBSD
kick Gentoo eh?
Cheers
Mark
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