Searching for Linux Ncq Support information? Find all needed info by using official links provided below.
https://www.linuxquestions.org/questions/linux-hardware-18/sata-ncq-support-in-linux-434589/
Apr 13, 2006 · Does NCQ is supported in linux? I'd like to bye Promise SATA300 TX2 plus controller and two NCQ-capable hdd's for software RAID0. Card support NCQ. Will it works on linux ? If both hdd and controller support NCq - is it enough for NCQ or there must be support by software drive also?
http://www.linux-ata.org/sata-status.html
Summary: No TCQ/NCQ in early chipsets. NCQ support added in later chipsets. Looks like a PATA controller, but with full SATA control including hotplug and PM. Update: NVIDIA has provided information (under NDA) that permits implementation of NCQ support, and a sample Linux implementation (patch) as well. Unfortunately, the patch needs debugging ...
http://www.linux-ata.org/faq.html
Enabling NCQ, if supported, is the same: $ echo 31 > /sys/block/sdX/device/queue_depth. Both the host controller and device constrain the number of NCQ commands that can be outstanding. The SATA specification maximum is 32 tags. Most devices support 32 tags, but the standard permits devices to support less. Similarly, most host controllers support 32 tags. However, the ATA standard has a …
https://unix.stackexchange.com/questions/211550/how-to-really-disable-ncq-in-linux
I would like to reproduce this scenario on my Linux PC, but the Linux AHCI driver has NCQ enabled by default. I need to disable NCQ, so I found this website describing how to disable NCQ, but it doesn't work. The Linux PC still reaches 190 MiB/s write performance.
https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.1-NCQ-Autosense
Apr 14, 2015 · Hannes Reinecke has implemented NCQ Autosense support from the new ATA command specification (ACS-4). Hannes explained in his patches, "with ACS-4 ATA drives inherited the possibility to return SCSI sense codes, allowing for a more precise error handling. Not to mention a nice alignment with the SCSI error handling.
https://ata.wiki.kernel.org/index.php/Libata_FAQ
Enabling NCQ, if supported, is the same: $ echo 31 > /sys/block/sdX/device/queue_depth Both the host controller and device constrain the number of NCQ commands that can be outstanding. The SATA specification maximum is 32 tags. Most devices support 32 tags, but the standard permits devices to support …
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