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scsi: megaraid_sas: Selectively apply stream detection based on IO type

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Performance improvement:

Current driver calls stream detection unconditionally for all IOs.
Stream Detection logic is not required for most of the fast path IO. To
improve performance, avoid stream detection logic and do it only if
required.

Below are the cases where stream detection is required in driver:

1. All non-FastPath IOs (IOs going to FW)
2. Fast Path reads sent to ReadAhead capable VDs.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Shivasharan S 2018-01-05 05:27:45 -08:00 committed by Martin K. Petersen
parent 5f19f7c879
commit 4959e61b83
1 changed files with 14 additions and 10 deletions
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24
drivers/scsi/megaraid/megaraid_sas_fusion.c
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@ -2664,16 +2664,6 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
praid_context = &io_request->RaidContext;
if (instance->adapter_type == VENTURA_SERIES) {
spin_lock_irqsave(&instance->stream_lock, spinlock_flags);
megasas_stream_detect(instance, cmd, &io_info);
spin_unlock_irqrestore(&instance->stream_lock, spinlock_flags);
/* In ventura if stream detected for a read and it is read ahead
* capable make this IO as LDIO
*/
if (is_stream_detected(&io_request->RaidContext.raid_context_g35) &&
io_info.isRead && io_info.ra_capable)
fp_possible = false;
/* FP for Optimal raid level 1.
* All large RAID-1 writes (> 32 KiB, both WT and WB modes)
* are built by the driver as LD I/Os.
@ -2699,6 +2689,20 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
}
}
if (!fp_possible ||
(io_info.isRead && io_info.ra_capable)) {
spin_lock_irqsave(&instance->stream_lock,
spinlock_flags);
megasas_stream_detect(instance, cmd, &io_info);
spin_unlock_irqrestore(&instance->stream_lock,
spinlock_flags);
/* In ventura if stream detected for a read and it is
* read ahead capable make this IO as LDIO
*/
if (is_stream_detected(&io_request->RaidContext.raid_context_g35))
fp_possible = false;
}
/* If raid is NULL, set CPU affinity to default CPU0 */
if (raid)
megasas_set_raidflag_cpu_affinity(praid_context,