2017/06/20 午前9:16 "Sean Greenslade" <s...@seangreenslade.com>:
A couple of notes: On Sun, Jun 18, 2017 at 10:21:33PM -0700, Alan E. Davis via arch-general wrote: > Hello everyone: > > I built a new machine with a Samsung SSD 960 EVO NVMe > <https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjWxp_ rk8nUAhWBfn4KHadiANoYABABGgJwYw&ohost=www.google.com&cid= CAESEeD2DLyQ7hEOLOBgSPqc9iEd&sig=AOD64_35gPrHU2xXVzC269PD9qfp0UjlwQ& ctype=5&q=&ved=0ahUKEwi6nZrrk8nUAhUE42MKHXAuDBsQww8ILA&adurl=>Samsung > SSD 960 EVO NVMe > <https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjWxp_ rk8nUAhWBfn4KHadiANoYABABGgJwYw&ohost=www.google.com&cid= CAESEeD2DLyQ7hEOLOBgSPqc9iEd&sig=AOD64_35gPrHU2xXVzC269PD9qfp0UjlwQ& ctype=5&q=&ved=0ahUKEwi6nZrrk8nUAhUE42MKHXAuDBsQww8ILA&adurl=>Samsung > 950 EVO NVMe M.2 500GB component. Please don't link to ads. A page like this is much more appropriate: http://www.samsung.com/semiconductor/minisite/ssd/ product/consumer/960evo.html > Installation went swell. I was able to > use bootctl (by whatever name), which seemed to be easier than using GRUB. > (on the Manjaro wiki was found an extremely coherent discussion of this > system). I have encountered no problems other than slow-ish (if one would > call it that). > > When I run hdparm to test the performance of this memory, it falls far > short of the specification of 32 Gb/s. Where did you get that number? All the specs I see for these drives show transfer rates in MB/s. You may have confused the read/write specs of the drive with the link speed of the NVMe / PCIe bus. The two are not the same. Also note that the read/write speeds are spec'd as "up to" speeds, so they are not guaranteeing any minimum speeds. Perhaps I'm just jaded, but I would be happy to get anything close to a spec-sheet speed on consumer hardware. > I realize that the Linux kernel has > recently included some code for the NVME drivers. There is also some > question as to the best parameters to use in /etc/fstab. That will depend entirely on the filesystem you choose. Also note that real-world filesystems rarely do perfectly sequential reads or writes, so your real world read/write performance will almost certainly be lower than any HDD test utility shows. --Sean Also, it is depends on "How you connect NVMe" and "How M/B handles it", also "what filesystem you use".
