On Wed, Jan 19, 2011 at 10:36 PM, Mag Gam <magawake@xxxxxxxxx> wrote: > Running on Redhat 5.1 if I do, > dd bs=1024 count=1000000 if=/dev/zero of=/dev/null > > I get around 30Gb/sec > > However, when I do this with 2.6.37 I get close to 5GB/sec > > Is there anything new in the kernel? > > TIA Mag, assuming you really meant 30 GB/sec vs. 5 GB/sec and there are no errors in your test, why do you care? ie. There is no comm or storage device I use that can run 5 GB/sec. In fact 1 GB/sec is pretty fast for most storage. Or is this more a curiosity thing? The performance loss could be /dev/zero, dd, or /dev/null. I would guess /dev/zero which is why I wonder what you need to track this down. A performance limited /dev/zero at 5 GB/sec is not a big issue for most uses. Greg -- Greg Freemyer Head of EDD Tape Extraction and Processing team Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer CNN/TruTV Aired Forensic Imaging Demo - http://insession.blogs.cnn.com/2010/03/23/how-computer-evidence-gets-retrieved/ The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
