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It looks like TRIM isn't functional, although I'm not that surprised. After the torture, I TRIM'ed all user-accessible LBAs and ran HD Tach to produce the graph below: To test TRIM, I took a secure erased XP941 and filled it with sequential data, followed by a 60-minute torture with 4KB random writes (QD32).
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Samsung SSD XP941 512GB - Iometer 128KB Sequential Write (QD1)Īnd TRIM seems to function as it should, so it indeed looks like this is just a Windows 7 limitation, which is excellent news. I ran the same 128KB sequential write test that we usually run (QD=1, 100% LBA) but extended the length to 10 minutes to ensure that the results are steady and not affected by burst performance. To measure performance, I had to rely on Iometer as HD Tach didn't work properly under Windows 8.
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To try this, I installed Windows 8.1 to a secondary drive and ran our regular pre-conditioning (fill with sequential data and torture with 4KB random write for 60 minutes).
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Update 5/20: I got an email from one of our readers suggesting that the TRIM issue might be related to Windows 7 and that Windows 8 should have functioning TRIM for PCIe SSDs. I wouldn't say the IO consistency is outstanding because the Plextor M6e does slightly better with the default over-provisioning (both drives have ~7%) but if you increase the over-provisioning the XP941 will show its magic.
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Samsung has made some tweaks to their garbage collection algorithms and overall the IO consistency gets a nice bump over the 840 Pro but still, this is something we've already seen with SATA 6Gbps SSDs. The graphs above and below illustrate this as the XP941 isn't really any faster than the SATA 6Gbps based 840 Pro. Ultimately the NAND performance is the bottleneck, so without faster NAND we aren't going to see any major increases in steady-state performance. The interface has never been the bottleneck when it comes to random write performance, especially in steady-state. Click the buttons below each graph to switch the source data.įor more detailed description of the test and why performance consistency matters, read our original Intel SSD DC S3700 article. The second and third one zoom into the beginning of steady-state operation (t=1400s) but on different scales: the second one uses log scale for easy comparison whereas the third one uses linear scale for better visualization of differences between drives. The first one is of the whole duration of the test in log scale. This gives us a look into the drive’s behavior with varying levels of empty space, which is frankly a more realistic approach for client workloads.Įach of the three graphs has its own purpose. We are also testing drives with added over-provisioning by limiting the LBA range. The test is run for just over half an hour and we record instantaneous IOPS every second. Next we kick off a 4KB random write workload across all LBAs at a queue depth of 32 using incompressible data. To test IO consistency, we fill a secure erased SSD with sequential data to ensure that all user accessible LBAs have data associated with them. When and how an SSD decides to run its defrag or cleanup routines directly impacts the user experience as inconsistent performance results in application slowdowns. The reason we don’t have consistent IO latency with SSD is because inevitably all controllers have to do some amount of defragmentation or garbage collection in order to continue operating at high speeds. But I thought setting up TRIM and releaseing a lot of space on the device afterwards should help.įor clarification: It's a Samsung 840 DXT06B0Q which uses TLC.Performance consistency tells us a lot about the architecture of these SSDs and how they handle internal defragmentation. When not using TRIM, blocks aren't reallocated the way they should be which causes bad performance.
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Is there a way to make them fast again or are they toast now?įrom my understanding, TRIM is needed to tell the SSD which parts of it can be reused and therefore helping the internal controller to find free blocks faster (as blocks aren't mapped statically like on an HDD). Now I have TRIM enabler setup and have been filling and emptying the SSDs during work a few times, but the performance while writing still sucks. But beginning this year the performance started to fall and I realized it could be because I didn't use Trim Enabler. At first they were amazingly fast (About 500 MB/s writing speed). About 16 months ago I upgraded my Mac Pro and replaced my video RAID-0 (made of two Velociraptors) with two Samsung 840 SSDs (RAID0 as well, as the Mac Pro only supports SATA-300).