linux-kernel - [PATCH] scsi: megaraid_sas: disabled shared host tagset feature by default

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Date: Mon, 11 Mar 2024 16:54:12 +0800
From: mengfanhui <mengfanhui@...inos.cn>
To: kashyap.desai@...adcom.com,
	sumit.saxena@...adcom.com,
	shivasharan.srikanteshwara@...adcom.com,
	chandrakanth.patil@...adcom.com
Cc: linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	mengfanhui@...inos.cn
Subject: [PATCH] scsi: megaraid_sas: disabled shared host tagset feature by default

By default, the host_tagset_enable feature is disabled，Fio performance
has improved significantly

fio test command:
sudo fio -filename=/fio_test -direct=1 -iodepth 32 -thread -rw=write -ioengine=libaio
-bs=4K -size=5120M -runtime=600 -numjobs=$CPUN -group_reporting -name=**.result >> **.result

The test data results bw  are as follows：
              v6.8_kernel       v6.8_kernel_disable_host_tagset
4k randwrite     375                     642
4k randread      210                     784
4k  write        306                     387
4k  read         435                     2457
128k write       355                     380
128k read        976                     3665
1M   read        415                     3122

Signed-off-by: mengfanhui <mengfanhui@...inos.cn>
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 3d4f13da1ae8..da19c4c07f2f 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -123,9 +123,9 @@ MODULE_PARM_DESC(poll_queues, "Number of queues to be use for io_uring poll mode
 		"High iops queues are not allocated &\n\t\t"
 		);
 
-int host_tagset_enable = 1;
+int host_tagset_enable;
 module_param(host_tagset_enable, int, 0444);
-MODULE_PARM_DESC(host_tagset_enable, "Shared host tagset enable/disable Default: enable(1)");
+MODULE_PARM_DESC(host_tagset_enable, "Shared host tagset enable/disable Default: disable(0)");
 
 MODULE_LICENSE("GPL");
 MODULE_VERSION(MEGASAS_VERSION);
-- 
2.25.1