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The way in which commands and responses are sent and received is a key difference between NVMe and NVMe over Fabrics. NVMe relies on the PCIe interface protocol to map commands and responses to shared host memory. In contrast, NVMe over Fabrics enables use of PCIe alternatives for communications between an NVMe host and target storage devices.
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Nov 03, 2015 · By a queue depth of 16 the NVMe drives are clearly earning their keep and at a queue depth of 128 the SATA drives might as well have been magnetics. To give you an idea of what I'm talking about, I was seeing between 4x and 5x higher latency off of the SATA drives at QD128 and at least 4x higher throughput.
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Nov 15, 2013 · AHCI NVMe Maximum Queue Depth 1 command queue 32 commands per Q 64K queues 64K Commands per Q Un-cacheable register accesses (2K cycles each) 6 per non-queued command 9 per queued command 2 per command MXI-X and Interrupt Steering Single interrupt; no steering 2K MSI-X interrupts Parallelism & Multiple Threads Requires synchronization lock
Increasing the depth of an application socket queue is typically the easiest way to improve the drain rate of a socket queue, but it is unlikely to be a long-term solution. To increase the depth of a queue, increase the size of the socket receive buffer by making either of the following changes:
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Jul 09, 2015 · = (HBA1 queue depth + HBA2 queue depth) / (lun_queue_depth per lun) = (8192 + 8192) / 512 = 16384 / 512 = 32 LUNS. Theoretically, the server can push 32 LUNs * 512 queue slots per LUN = 16384 IO’s per every 10ms (average latency) , WOW !!!
In general, io depth and queue depth are the same. They are the number of IOs a device/controller can have outstanding at a time, the other IOs will be pending in a queue at the OS/app level. You use a low queue depth to get lower latencies and a higher queue depth to get better throughput.
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High-level comparison of AHCI and NVMe AHCI NVMe Maximum queue depth One command queue; 32 commands per queue: 65535 queues; 65536 commands per queue Uncacheable register accesses (2000 cycles each) Six per non-queued command; nine per queued command: Two per command Interrupt A single interrupt: Up to 2048 MSI-X interrupts Parallelism
Hi, I recently got a new dedi with two samsung sm961 NVMe SSDs and I wated to test the write/ read performance. I'm using a Software Raid 1. According to benchmarks, this SSD should write with 2.7 GB/s and read with 1.7 GB/s. Sep 28, 2017 · -Queue Depth. Not only is it cheaper than the h730, the queue depth is almost 10 times larger! Granted, both controllers are way above the minimum recommended depth for VSAN, but the hba 330 seems practically built for this purpose.
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AHCI NVMe Maximum queue depth 1 command queue 32 commands 65536 queues 65536 commands per queue MMIO 6 reads+writes/non-queued command 9 reads+writes/queued command 2 writes/command Interrupts and steering Single interrupt 2048 MSI-X interrupts CPU affinity Parallelism Single sync lock to issue command Per-CPU lock contention free Command Transfer Efficiency Intel NUC8i7BEH Asura NVMe SSD Iris Plus Graphics 655, i7-8559U, Asura Genesis Xtreme NVMe M.2 SSD 1 TB Samsung 960 Pro 1TB Titan X Pascal, E5-2680 v4, Samsung SSD 960 Pro 1TB m.2 NVMe; ATTO Disk ...
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PCIe Gen3 x4 NVMe 1.3 Controller Silicon Motion SM2262 Height 3.8mm Width 80mm Depth 22mm Performance Max Sequential Read 2710MB/s Max Sequential Write 1775MB/s 4KB Random Read Up to 283,000 IOPS 4KB Random Write Up to 280,000 IOPS Seek Time <0.1ms MTBF 1,500,000 hours Features
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NVMe: Linux History. Active development community: • 59 Change sets since initial commit • 7 companies contributed patches • Multiple Linux distributors ported driver to earlier kernel releases. 5. NVMe: Queue allocation details. • Submission/Completion queue pairs.
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In the Linux server, device assignments sometimes change after reboots. Sometimes, the PCIe flash card can be assigned /dev/sda. Other times, it can be assigned /dev/sdd, or any device name. This variability can wreak havoc when modifying the Linux environment variables.
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