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Re: [TEKNIK] disc cache, ramdisk, mm.



On Fri, Jun 15, 2007 at 08:37:37AM +0200, Mogens Kjaer wrote:
> Kristian Kallenberg wrote:
> ...
> >spock ~ # time dd if=/dev/hda of=/dev/null bs=8192 count=100000
> >100000+0 records in
> >100000+0 records out
> >819200000 bytes (819 MB) copied, 14,4089 s, 56,9 MB/s
> >
> >real    0m14.413s
> >user    0m0.026s
> >sys     0m1.223s
> >
> >spock ~ # time dd if=/dev/hda of=/dev/null bs=8192 count=100000
> >100000+0 records in
> >100000+0 records out
> >819200000 bytes (819 MB) copied, 14,394 s, 56,9 MB/s
> 
> Det får jeg ikke:
> 
> # time dd if=/dev/sda of=/dev/null bs=8192 count=100000
> 100000+0 records in
> 100000+0 records out
> 819200000 bytes (819 MB) copied, 3.70776 seconds, 221 MB/s
> 
> real    0m3.811s
> user    0m0.041s
> sys     0m0.800s
> # time dd if=/dev/sda of=/dev/null bs=8192 count=100000
> 100000+0 records in
> 100000+0 records out
> 819200000 bytes (819 MB) copied, 0.395932 seconds, 2.1 GB/s
> 
> Måske er 1G RAM ikke nok til at cache 819MB?

Det er lidt sjovt, hvis jeg udskifter hda med sda får jeg samme resultat
som dig. Måske bruges cache ikke på mine IDE diske? Jeg er lidt
forvirret her.

/kallenberg


 
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