Here the JMicron controller behaved like all other drives, but where it differed is what happened after the test was stopped. When running my fragmentation tool, I observe IOPS drop as the drive becomes more and more overloaded with the task of tracking the random writes taking place. "I don't have and pretty charts or graphs to explain this next part, but I will share an observation I made during my fragmentation testing. Even cheap shitty compactflash could beat a Velociraptor or even 15k rpm SAS disks in some latency-sensitive workloads even though they are limited to something like 20MB/s throughput. Booting and starting apps on any SSD is way much faster than a fast HDD. I will add, though, that while it may be one of the slowest SSDs, it is still a giant leap faster than any HDD regarding latencies. In benchmarks this could be seen as the 4K QD32/64 scores would approach the theoretical benefits of 10 parallel channels, and thus is up to 10 times the score of the normal 4K test with only a single queue. Intel controller has 10 parallel flash channels. On systems with AHCI/NCQ enabled and with an SSD capable of NCQ (Intel, SandForce, Micron, Indilinx) you would see much higher scores for 4K QD32/64 reads (not writes that works differently). With NCQ disabled, the 4K random read and 4K-32/64 scores as seen in CDM/AS SSD would be about the same just like yours is. NCQ is needed for SSDs to receive multiple I/O commands at once. More recent chips from JMicron had this problem under control, but it remains the 'budget'/'value' option amongst SSDs and concertainly not as advanced as Intel controller.įor example, JMicron does not support NCQ. The JMicron controller had caused 'stuttering' SSDs in its first generation (JMB-602) and therefore got its bad reputation. Some models actually laser-etched JMicron off and put Toshiba on it, to obscure the fact that it is powered by a JMicron controller. If you have TRIM capability then the file that AS SSD/CrystalDiskMark wrote to will be truncated without TRIM like on RAID0 arrays on windows yes benchmarking would slow down the drive but normal usage does that have a JMicron SSD the brand may be Kingston, but the controller chip is labeled JMicron. I checked early on and it said TRIM was enabled. My motherboard, an abit ip35e, does not support AHCI. My SSD is a Kingston 64GB SSDNow V Series. I was thinking maybe making a backup, re-initialize the drive with HDDErase, then reload from the backup? Using Macrium Reflect (free)? Would this preserve the correct disk alignment? Would it "straighten out" the disk similar to a defrag or restore it sector by sector, restoring any disarray existing on the disk? So, what wrecked my performance? Running the benchmark tool twice, or running the Paragon Partition Alignment Tool? (I can't provide any benchmark screen results until tonight at the earliest) I went out and got this Paragon Partition Alignment Tool and ran it. It also said my drive was not aligned on a 4K boundry (actually, none of my drives/partitions were). I ran the benckmark and got a final result of 148. I was reading another thread in this forum and it mentioned the AS SSD benchmark program, and how it checked drive alignment. Do benchmark programs such as AS SSD benchmark degrade perfomance of the drive they are testing by the act of executing their write tests?
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