JoaoBR wrote:
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 :)
Oh dear :-), I'm actually a FreeBSD guy, I just happen to need a Linux
box because the product I'm working on does not build on FreeBSD
(yet....heh heh).
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
Sorry JoaoBR - I am interested!
I was however trying to point out that as your machine is different from
mine (opteron and ddr*400* as opposed to PIII and pc133), the fact that
it is faster is not telling us anything about whether releng_6
performance on cached file reads could be improved!
In fact if you note that the PIII HW *can* actually do 700MB/s, it
suggests that your HW is capable of considerably more than 900MB/s -
given that opteron's have excellent cpu to memory bandwidth, and the
speed of your memory!
Cheers
Mark
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