The test was modified to run in a 91GB space on the MBA’s Boot Camp partition. I ran a modified version of our IO consistency test. Seeing as how this is our first experience with Samsung’s PCIe SSD controller, I wanted to get a feel for how the drive behaved under extended high queue depth random writes. If you have an external Thunderbolt array with at least a couple of drives, you should have no issues matching the MBA’s internal SSD performance. I saw roughly 300MB/s reads and 300MB/s writes when copying a large dmg from/to the MacBook Air’s PCIe SSD (compared to roughly 200/200MBps on the old Samsung SATA SSD from the rMBP15). Large file copies confined to the drive itself benefit a bit as well. The funny thing is that with the exception of high-speed Thunderbolt arrays, most external sources aren’t fast enough to even stress the new storage subsystem in the MacBook Air. Wake from sleep is a bit quicker, as are application launches. What does this mean in the real world? The new SSD is definitely snappier in system use.
Low queue depth sequential transfers can’t be split up enough in order to really require PCIe. Sequential speeds are much improved but the gains are really only visible at high queue depths. Random write performance took a bit of a hit but it's still more than fast enough for client workloads. Peak random read performance is roughly comparable to the previous-generation Samsung controller. I created a Boot Camp partition of around 120GB and ran our client iometer benchmarks to put the new PCIe SSD’s performance in perspective.
0 kommentar(er)
