Cached file read performance with 6.2-PRERELEASE

[Mark Kirkwood]

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?

Cheers

Mark