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| author | Suganath Prabu <suganath-prabu.subramani@broadcom.com> | 2019-02-15 10:40:28 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-03-19 00:16:43 +0300 |
| commit | 51e3b2ad6de2b135d0fc7170f1b133f4e7a7639d (patch) | |
| tree | c36b532d14e54a65827af0b1fa6be3925b153e99 /drivers/scsi/mpt3sas/mpt3sas_base.h | |
| parent | 320e77acb32774b6addfe38d562956fad70c5f0d (diff) | |
| download | linux-51e3b2ad6de2b135d0fc7170f1b133f4e7a7639d.tar.xz | |
scsi: mpt3sas: Load balance to improve performance and avoid soft lockups
Driver uses "reply descriptor post queues" in round robin fashion so that
IO's are distributed to all the available reply descriptor post queues
equally. With this each reply descriptor post queue load is balanced.
This is enabled only if CPUs count to MSI-X vector count ratio is X:1
(where X > 1) This improves performance and also fixes soft lockups.
Signed-off-by: Suganath Prabu <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/mpt3sas/mpt3sas_base.h')
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_base.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h index fb572cdb751e..3895407183ff 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.h +++ b/drivers/scsi/mpt3sas/mpt3sas_base.h @@ -1024,6 +1024,9 @@ typedef void (*MPT3SAS_FLUSH_RUNNING_CMDS)(struct MPT3SAS_ADAPTER *ioc); * @msix_vector_count: number msix vectors * @cpu_msix_table: table for mapping cpus to msix index * @cpu_msix_table_sz: table size + * @total_io_cnt: Gives total IO count, used to load balance the interrupts + * @msix_load_balance: Enables load balancing of interrupts across + * the multiple MSIXs * @schedule_dead_ioc_flush_running_cmds: callback to flush pending commands * @scsi_io_cb_idx: shost generated commands * @tm_cb_idx: task management commands @@ -1200,6 +1203,8 @@ struct MPT3SAS_ADAPTER { u32 ioc_reset_count; MPT3SAS_FLUSH_RUNNING_CMDS schedule_dead_ioc_flush_running_cmds; u32 non_operational_loop; + atomic64_t total_io_cnt; + bool msix_load_balance; /* internal commands, callback index */ u8 scsi_io_cb_idx; |