> On Jan 31, 2008 2:25 PM, Nicholas A. Bellinger <nab@linux-iscsi.org> wrote:
> > Since this particular code is located in a non-data path critical
> > section, the kernel vs. user discussion is a wash. If we are talking
> > about data path, yes, the relevance of DD tests in kernel designs are
> > suspect :p. For those IB testers who are interested, perhaps having a
> > look with disktest from the Linux Test Project would give a better
> > comparision between the two implementations on a RDMA capable fabric
> > like IB for best case performance. I think everyone is interested in
> > seeing just how much data path overhead exists between userspace and
> > kernel space in typical and heavy workloads, if if this overhead can be
> > minimized to make userspace a better option for some of this very
> > complex code.
>
> I can run disktest on the same setups I ran dd on. This will take some
> time however.
>
> Disktest is new to me -- any hints with regard to suitable
> combinations of command line parameters are welcome. The most recent
> version I could find on
http://ltp.sourceforge.net/ is ltp-20071231.
>
