Cached file read performance with 6.2-PRERELEASE

[JoaoBR]

On Wednesday 20 December 2006 07:37, Mark Kirkwood wrote:
> JoaoBR wrote:
> > On Tuesday 19 December 2006 22:05, Mark Kirkwood wrote:
> >> $ dd of=/dev/null if=/tmp/file bs=32k                  # read it
> >> 819200000 bytes transferred in 1.801944 secs (454620117 bytes/sec)
> >
> > hum, look my releng_6:
> >
> > # dd of=/dev/null if=/c/c1/file bs=32k
> > 819200000 bytes transferred in 0.896507 secs (913768635 bytes/sec)
>
> Hmm - so your machine reads memory twice as fast as mine, which is
> great! but I'm not sure it actually shows anything useful ... let me
> guess - a P4 with DDR or DDR2 memory??? maybe if we look a bit harder at
> buffer cache performance you could get 1.2GB/s or more - wouldn't that
> be a good thing?


oh! if it is useful or not seems to be your call, you was the one who said 
linux is twice as fast as freebsd :)

it's a dual-opteron with ddr400 I just compiled world with no tweaks and 
standard newfs options

if you're interested I send new results after completing my setup

-- 

João







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