On Fri, 18 Apr 2014, Alexander Hall wrote:

> 
> 
> On April 18, 2014 2:55:33 PM CEST, Paco Esteban <p...@onna.be> wrote:
> >On Fri, 18 Apr 2014, Alexander Hall wrote:
> >
> >> 
> >> 
> >> On April 18, 2014 2:45:33 PM CEST, Paco Esteban <p...@onna.be> wrote:
> >> >On Fri, 18 Apr 2014, Alexander Hall wrote:
> >> >
> >> >> 
> >> >> 
> >> >> On April 18, 2014 2:38:08 PM CEST, Paco Esteban <p...@onna.be>
> >wrote:
> >> >> >On Fri, 18 Apr 2014, Alexander Hall wrote:
> >> >> >
> >> >> >> 
> >> >> >> 
> >> >> >> On April 18, 2014 12:39:16 PM CEST, Paco Esteban <p...@onna.be>
> >> >> >wrote:
> >> >> >> >Hi all,
> >> >> >> >
> >> >> >> >I've a Lenovo T400 laptop with a SanDisk 64GB SSD disk.
> >> >> >> >It used to have Debian 7 on it (everything working just fine),
> >> >and
> >> >> >now
> >> >> >> >I
> >> >> >> >want to use it as my personal laptop with OpenBSD.
> >> >> >> >
> >> >> >> >I've installed 5.4. Everything is working great (sound,
> >webcam,
> >> >etc)
> >> >> >> >but
> >> >> >> >disk. I get ~40MB/s writing and reding to and from disk. This
> >> >very
> >> >> >same
> >> >> >> >disk reported 250MB/s reading and 190MB/s writing on debian7.
> >> >> >> 
> >> >> >> How did you measure this on openbsd? Copying files? dd? 
> >> >> >> 
> >> >> >> /Alexander
> >> >> >
> >> >> >dd in both OS's. Block size 1MB, count 5k from /dev/zero
> >> >> >RAM is 4GB on this machine.
> >> >> 
> >> >> Do you use the raw device, e.g. /dev/rsd1c ?
> >> >> 
> >> >> /Alexander
> >> >
> >> >No, I used something like this:
> >> >
> >> >dd if=/dev/zero of=foo.bin bs=1048576 count=5000
> >> 
> >> To measure raw disk performance, dd to/from a raw partition (need not
> >be 'c') is your friend.
> >> 
> >> Others maybe can explain filesystem overhead.
> >
> >Will I break things if I dd to raw device /dev/rsd0d (/dev/sd0d is
> >mounted on /tmp in my case) ?
> 
> Most certainly, yes. Reading *from* said device is not a problem though. Just 
> don't get it the wrong way... :-)

It gives 188MB/s from a raw device to /dev/null :-/

Cheers,

-- 
Paco Esteban.
GnuPG key: 0x0E1192A4

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