Messages in this thread | | | Date | Thu, 27 Mar 2008 17:53:03 -0400 | From | Bill Davidsen <> | Subject | Re: RAID-1 performance under 2.4 and 2.6 |
| |
Bart Van Assche wrote: > On Tue, Mar 25, 2008 at 11:00 PM, Chris Snook <csnook@redhat.com> wrote:
>> It means you shouldn't use dd as a benchmark. > > If you want to benchmark write speed, you should add > oflag=direct,dsync to the dd command line. For benchmarking read speed > you should specify iflag=direct. Or, even better, you can use xdd with > the flags -dio -processlock. > No, you want your benchmark to measure performance doing what the application does. Do unless you have an application which has been heavily Linux-ized you don't want to measure something unrelated to the application requirements.
-- Bill Davidsen <davidsen@tmr.com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot
| |