On Sun, Mar 18, 2018 at 12:32:07PM -0400, Russell via talk wrote: > With all the CPU cache fencing going on I thought it might be fun to fiddle > with NVM express on Fedora 27. My primary SSD on this z370-A, was/is in > build limbo while I updated bios and waited for outcomes. > > I installed a 32gib module from Newegg ($90 delivered) and I booted from > F27-workstation live on usb. I let the anaconda installer do the automatic > partitioning. 5gib of the 32gib reported was left unallocated for > over-provisioning. > > First boot appeared to be twice as fast as on the SATA SSD. Three or four > seconds to get to the gui login as opposed to 7 or 8 on the original drive. > > Had to install hdparm from the repo. > > # hdparm -tT --direct /dev/sda1 > > /dev/sda1: > Timing O_DIRECT cached reads: 930 MB in 2.00 seconds = 464.92 MB/sec > Timing O_DIRECT disk reads: 1370 MB in 3.00 seconds = 456.30 MB/sec > > # hdparm -tT --direct /dev/nvme0n1 > > /dev/nvme0n1: > Timing O_DIRECT cached reads: 2302 MB in 2.00 seconds = 1151.84 MB/sec > Timing O_DIRECT disk reads: 3474 MB in 3.00 seconds = 1157.65 MB/sec > > More info on Nvme with a nice diagram of the Linux storage stack here. > > https://en.m.wikipedia.org/wiki/NVM_Express > > I switched back to the original SSD. An os-probe mapped the device to > /dev/dm-1 and I was able to remake grub.conf and add this install to the > bootloader on that drive. > > A couple of switches back and forth between drives and it looks like the 10% > performance hit I had experienced after the microcode updates, is now > somewhat reduced, +-5%. > > Guilding the lilly a bit, as I didn't have any day to day problems with > performance. Although it's hard to name Intel's product actions around this > issue a field of Lilly's.
Not bad, but I think for my money I would get an EVO 960 instead. Twice the speed and 8 times the space for just under twice the money. Or 16 times the space for three times the money. I just don't see any advantage to the Optane at this point. -- Len Sorensen --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
