On 17 Nov 2024 at 15:44, Stephen Morris wrote: Date sent: Sun, 17 Nov 2024 15:44:51 +1100 Subject: Re: Fedora F41 Hard Disk Performance To: users@xxxxxxxxxxxxxxxxxxxxxxx From: Stephen Morris <steve.morris.au@xxxxxxxxx> Copies to: steve.morris.au@xxxxxxxxx Send reply to: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx> > > On 17/11/24 11:54, Chris Adams wrote: > Once upon a time, Stephen Morris <steve.morris.au@xxxxxxxxx> said: > > To test my hard disk performance I have run Kdiskmark and used > the Real World Performance Profile. For its sequential read > performance it is showing around 156 MB/s on my ST3000DM007-1WY1 > (3TB Seagate Barracuda), which given that device support 1/3/6 Gb/s > I/O speeds and the device is plugged into a 6Mb/s Sata port on the > motherboard, is very poor performance. > > > That's a misunderstanding of how things work. The SATA port speed is > just an upper-bound on transfer, but has nothing to do with how fast a > device can actually read data (similar to having a 1G network card and > even Internet service doesn't mean sites will serve data to you at 1G). > Traditional spinning hard drives typically do top out in the > neighborhood of 150 MB/s... and in fact, the official spec from Seagate > for that drive is an average read rate of 156 MB/s. > If that is the case why does the specs for that device under performance > say it will support speeds of 1Gb/s, 3Gb/s and 6Gb/s. I've always hdparm -Tt to test drives. hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 10716 MB in 1.99 seconds = 5377.96 MB/sec Timing buffered disk reads: 700 MB in 3.00 seconds = 232.99 MB/sec In this case the cached speed is reading data from the drives ram buffer. The second one is reading directly from the disk without using the cache. My other notebook is newer and has a SSD drive, and nvme drive, and a memory card. hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 32260 MB in 1.98 seconds = 16287.27 MB/sec Timing buffered disk reads: 1484 MB in 3.00 seconds = 494.39 MB/sec root@setzcodell:~# hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 34946 MB in 1.99 seconds = 17574.52 MB/sec Timing buffered disk reads: 1342 MB in 3.00 seconds = 447.31 MB/sec root@setzcodell:~# hdparm -Tt /dev/mmcblk0p1 /dev/mmcblk0p1: Timing cached reads: 35092 MB in 1.98 seconds = 17717.93 MB/sec Timing buffered disk reads: 62 MB in 1.34 seconds = 46.19 MB/sec > > regards, > Steve > > > > > > +------------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor (Retired) mailto:mikes@xxxxxxxx mailto:msetzerii@xxxxxxxxx mailto:msetzerii@xxxxxxx Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +------------------------------------------------------------+ -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
