On Wed, Dec 10, 2008 at 4:15 PM, Raz Ben-Yehuda <razb@xxxxxxxxxxx> wrote: > Hello > I am wondering if anyone tried Intel new disks. I benchmark them and I > am a bit confused. > According to the spec a single disk should provide 70MB/s write and 250 > MB/s read. Reads are ok. I am reaching this number, but writes are bad. > With writes I am getting 20MB/s. > I am using a dd for the test, and a deadline-line scheduler. > > Thank you > Raz FYI: Some recent kernel's have performance bugs in /dev/zero. (The bug may only exist ins SuSE kernels, not sure.) Be sure to baseline it before you trust it for any benchmarks. My current machine/kernel is plenty fast to use but you need to be sure and it only takes a minute. # dd if=/dev/zero of=/dev/null bs=1M count=100000 100000+0 records in 100000+0 records out 104857600000 bytes (105 GB) copied, 33.4257 s, 3.1 GB/s Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
