Cached file read performance with 6.2-PRERELEASE

Mark Kirkwood markir at
Thu Dec 21 03:34:10 PST 2006

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.


Gentoo :
- Supermicro P3TDER
- 2xSL5QL 1.26 GHz PIII
- 2xKingston PC133 RCC Registered 1GB DIMMS
- Promise TX4000 4x Maxtor plus 8 ATA-133 7200 40G

- 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 errm - *my* experimental method is how about we just get together and see how to make FreeBSD 
kick Gentoo eh?



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