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scsi: megaraid_sas: Use high IOPS queues based on IO workload 

The driver will use round-robin method for IO submission in batches within
the high IOPS queues when the number of in-flight ios on the target device
is larger than 8. Otherwise the driver will use low latency reply queues.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chandrakanth Patil 2019-06-25 16:34:34 +05:30 committed by Martin K. Petersen
parent f0b9e7bdc3
commit f39e5e52c5
4 changed files with 19 additions and 2 deletions
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3
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -2253,6 +2253,8 @@ enum MR_PD_TYPE {
/*Aero performance parameters*/
#define MR_HIGH_IOPS_QUEUE_COUNT 8
#define MR_DEVICE_HIGH_IOPS_DEPTH 8
#define MR_HIGH_IOPS_BATCH_COUNT 16
struct megasas_instance {
@ -2362,6 +2364,7 @@ struct megasas_instance {
atomic_t ldio_outstanding;
atomic_t fw_reset_no_pci_access;
atomic64_t total_io_count;
atomic64_t high_iops_outstanding;
struct megasas_instance_template *instancet;
struct tasklet_struct isr_tasklet;

1
drivers/scsi/megaraid/megaraid_sas_fp.c
View File

@ -1038,6 +1038,7 @@ MR_BuildRaidContext(struct megasas_instance *instance,
stripSize = 1 << raid->stripeShift;
stripe_mask = stripSize-1;
io_info->data_arms = raid->rowDataSize;
/*
* calculate starting row and stripe, and number of strips and rows

16
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -2811,6 +2811,7 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
io_info.r1_alt_dev_handle = MR_DEVHANDLE_INVALID;
scsi_buff_len = scsi_bufflen(scp);
io_request->DataLength = cpu_to_le32(scsi_buff_len);
io_info.data_arms = 1;
if (scp->sc_data_direction == DMA_FROM_DEVICE)
io_info.isRead = 1;
@ -2830,7 +2831,13 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
fp_possible = (io_info.fpOkForIo > 0) ? true : false;
}
if (instance->msix_load_balance)
if (instance->balanced_mode &&
atomic_read(&scp->device->device_busy) >
(io_info.data_arms * MR_DEVICE_HIGH_IOPS_DEPTH))
cmd->request_desc->SCSIIO.MSIxIndex =
mega_mod64((atomic64_add_return(1, &instance->high_iops_outstanding) /
MR_HIGH_IOPS_BATCH_COUNT), instance->low_latency_index_start);
else if (instance->msix_load_balance)
cmd->request_desc->SCSIIO.MSIxIndex =
(mega_mod64(atomic64_add_return(1, &instance->total_io_count),
instance->msix_vectors));
@ -3157,7 +3164,12 @@ megasas_build_syspd_fusion(struct megasas_instance *instance,
cmd->request_desc->SCSIIO.DevHandle = io_request->DevHandle;
if (instance->msix_load_balance)
if (instance->balanced_mode &&
atomic_read(&scmd->device->device_busy) > MR_DEVICE_HIGH_IOPS_DEPTH)
cmd->request_desc->SCSIIO.MSIxIndex =
mega_mod64((atomic64_add_return(1, &instance->high_iops_outstanding) /
MR_HIGH_IOPS_BATCH_COUNT), instance->low_latency_index_start);
else if (instance->msix_load_balance)
cmd->request_desc->SCSIIO.MSIxIndex =
(mega_mod64(atomic64_add_return(1, &instance->total_io_count),
instance->msix_vectors));

1
drivers/scsi/megaraid/megaraid_sas_fusion.h
View File

@ -962,6 +962,7 @@ struct IO_REQUEST_INFO {
u8 pd_after_lb;
u16 r1_alt_dev_handle; /* raid 1/10 only */
bool ra_capable;
u8 data_arms;
};
struct MR_LD_TARGET_SYNC {