From: hsggebhardt@googlemail.com (Henry Gebhardt)
To: kernelnewbies@lists.kernelnewbies.org
Subject: dd test discussion (was Re: possible regression?)
Date: Sat, 22 Jan 2011 13:00:27 +0100 [thread overview]
Message-ID: <20110122120025.GA32605@bimsstein> (raw)
In-Reply-To: <AANLkTi=LZvUg2Auuksq1s5pw00qdgvnO3Mh1AJ8D9vRi@mail.gmail.com>
On Sat, Jan 22, 2011 at 11:49:43AM +0700, Mulyadi Santosa wrote:
> On Fri, Jan 21, 2011 at 20:25, Mag Gam <magawake@gmail.com> wrote:
> > Anyone had a chance to try this? :-)
>
> $ for a in `seq 1 3`; do \time dd bs=4K count=1M if=/dev/zero of=/dev/null; done
Hm, I also wrote a little script to go through more values of bs. The
script is attached. To change what values to use for bs, change the
variables $min, $step, and $max at the beginning of the script, which
are the parameters for "seq". To get a graph of throughput versus bs,
use it like so:
$ ./pipespeed.sh > data
[...]
$ gnuplot
plot "data" w l
The highest I get is 8.5 GB/s with bs=22528 on 2.6.37.
How can you get a speed of 30 GB/s? It seems excessively fast. :)
Greetings,
Henry
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next prev parent reply other threads:[~2011-01-22 12:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-22 4:49 dd test discussion (was Re: possible regression?) Mulyadi Santosa
2011-01-22 12:00 ` Henry Gebhardt [this message]
2011-01-22 16:30 ` Mulyadi Santosa
2011-01-22 20:09 ` Henry Gebhardt
2011-01-23 3:25 ` Mulyadi Santosa
2011-01-22 17:41 ` Mulyadi Santosa
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