On Fri, Apr 18, 2014 at 7:55 AM, 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) ? > > Cheers, > > -- > Paco Esteban. > GnuPG key: 0x0E1192A4 >
you need to unmount it first: # unmount /dev/sd0d; # dd if=/dev/zero of=/dev/rsd0d bs=1M count=5000
