tmpfs(5) speeds

[Alexander Best]

hi there,

using 'time dd if=/dev/zero of=/tmp/test bs=1m count=500' i got a result of:

500+0 records in
500+0 records out
524288000 bytes transferred in 1.133749 secs (462437450 bytes/sec)
dd if=/dev/zero of=/tmp/test bs=1m count=500  0,00s user 1,33s system 99% cpu 1,332 total

isn't this a bit slow? i've seen people get speeds of 2 gigabytes/sec
running striped SSDs as fs backend.

the RAM i'm using is 2x1GB DDR2 non-ECC memory 800MHZ (PC2-6400) and CL4 (4-4-4-12).

http://en.wikipedia.org/wiki/DDR2_SDRAM shows a peek 6400 megabyte/sec.

i'm running HEAD on amd64.

cheers.
alex