diff options
| author |   Shivasharan S <shivasharan.srikanteshwara@broadcom.com> | 2019-05-07 10:05:36 -0700 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-06-18 19:46:19 -0400 |
| commit | 1d15d9098ad12b0021ac5a6b851f26d1ab021e5a (patch) | |
| tree | 841443e2d80e965679aba7a44dde8428a0e3c532 /drivers/scsi/megaraid/megaraid_sas_fusion.c | |
| parent | scsi: megaraid_sas: IRQ poll to avoid CPU hard lockups (diff) | |
| download | linux-dev-1d15d9098ad12b0021ac5a6b851f26d1ab021e5a.tar.xz linux-dev-1d15d9098ad12b0021ac5a6b851f26d1ab021e5a.zip | |
scsi: megaraid_sas: Load balance completions across all MSI-X
Driver will use "reply descriptor post queues" in round robin fashion when
the combined MSI-X mode is not enabled. With this IO completions are
distributed and load balanced across all the available reply descriptor
post queues equally.
This is enabled only if combined MSI-X mode is not enabled in firmware.
This improves performance and also fixes soft lockups.
When load balancing is enabled, IRQ affinity from driver needs to be
disabled.
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/megaraid/megaraid_sas_fusion.c')
| -rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_fusion.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index 5fdba1556039..66306ffb34a5 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -2768,8 +2768,13 @@ megasas_build_ldio_fusion(struct megasas_instance *instance, fp_possible = (io_info.fpOkForIo > 0) ? true : false; } - cmd->request_desc->SCSIIO.MSIxIndex = - instance->reply_map[raw_smp_processor_id()]; + if (instance->msix_load_balance) + cmd->request_desc->SCSIIO.MSIxIndex = + (mega_mod64(atomic64_add_return(1, &instance->total_io_count), + instance->msix_vectors)); + else + cmd->request_desc->SCSIIO.MSIxIndex = + instance->reply_map[raw_smp_processor_id()]; if (instance->adapter_type >= VENTURA_SERIES) { /* FP for Optimal raid level 1. @@ -3082,8 +3087,13 @@ megasas_build_syspd_fusion(struct megasas_instance *instance, cmd->request_desc->SCSIIO.DevHandle = io_request->DevHandle; - cmd->request_desc->SCSIIO.MSIxIndex = - instance->reply_map[raw_smp_processor_id()]; + if (instance->msix_load_balance) + cmd->request_desc->SCSIIO.MSIxIndex = + (mega_mod64(atomic64_add_return(1, &instance->total_io_count), + instance->msix_vectors)); + else + cmd->request_desc->SCSIIO.MSIxIndex = + instance->reply_map[raw_smp_processor_id()]; if (!fp_possible) { /* system pd firmware path */ |