Currently mpt3sas driver sets below predefined queue depth for the SAS/SATA/NVMe drives. SAS - 254 SATA - 32 NVME - 128 IOC Firmware provides the queue depth for each device types through SAS IO Unit Page1 for SAS/SATA and PCIe IO Unit Page1 for NVMe devices. If the host sets the queue depth greater than the firmware recommended queue depth, then IOC places the IO’s above the recommended queue depth in an internal pending queue (consuming outstanding host-credit/resources and thereby leading to potential starvation to other devices) and sends them to the device once IO count drops below the recommended queue depth. So, it is better for the driver to set the device queue depth provided by the IOC firmware. Suganath Prabu S (2): mpt3sas: Use FW recommended device QD mpt3sas: Update driver version to 39.100.00.00 drivers/scsi/mpt3sas/mpt3sas_base.c | 70 +++++++++++++++++++++++++++ drivers/scsi/mpt3sas/mpt3sas_base.h | 12 ++++- drivers/scsi/mpt3sas/mpt3sas_config.c | 37 ++++++++++++++ drivers/scsi/mpt3sas/mpt3sas_ctl.c | 5 +- drivers/scsi/mpt3sas/mpt3sas_scsih.c | 51 +++++++++++++++++-- 5 files changed, 167 insertions(+), 8 deletions(-) -- 2.27.0
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