• Sumit Saxena's avatar
    megaraid_sas: Dual queue depth support · 308ec459
    Sumit Saxena authored
    1. For iMR controllers, firmware will report two queue depths:
    
       - Controller-wide queue depth
       - LDIO queue depth (240)
    
    Controller-wide queue depth will be greater among the two. Using this
    new feature, iMR can provide larger Queue depth(QD) for JBOD and limited
    QD for Virtual Disk(VD).
    
    2. megaraid_sas driver will throttle read/write LDIOs based on "LDIO
    Queue Depth".
    
    3. Dual queue depth can be enabled/disabled via module parameter. It is
    enabled by default if the firmware supports it. Only specific firmware
    builds will enable the feature.
    
    4. Added sysfs parameter "ldio_outstanding" which permits querying the
    number of outstanding LDIO requests at runtime.
    Signed-off-by: default avatarSumit Saxena <sumit.saxena@avagotech.com>
    Signed-off-by: default avatarKashyap Desai <kashyap.desai@avagotech.com>
    Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
    308ec459
megaraid_sas_fusion.c 107 KB