Date: Fri, 4 Nov 2011 13:58:50 +0000 From: Alexander Best <arundel@freebsd.org> To: freebsd-fs@freebsd.org Subject: tmpfs(5) speeds Message-ID: <20111104135850.GA25559@freebsd.org>
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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
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