Hi Brian,
I set it by default. There are two reasons:
- The latest upstream kernel and kernels in linux distros didn't enable MQ
by default. Need to rebuild the kernel if want to use MQ feature.
- Didn't have time to test performance yet this year(Will try to find
system to test this when powerio-blue system is up today).
Thanks,
Wendy
From: Brian King <brk...@linux.vnet.ibm.com>
To: wenxi...@linux.vnet.ibm.com, iprdd-devel@lists.sourceforge.net
Date: 07/06/2016 09:34 AM
Subject: Re: [Iprdd-devel] [PATCH 3/3] ipr: Add scsi multi-queue support
On 07/05/2016 12:44 PM, wenxi...@linux.vnet.ibm.com wrote:
> From: Wen Xiong <wenxi...@linux.vnet.ibm.com>
>
> Add scsi multi-queue support in ipr driver. This feature
> is enabled by setting ipr_use_blk_mq=1 when loading ipr
> module and scsi blk-mq is enabled in the kernel.
>
> Signed-off-by: Wen Xiong <wenxi...@linux.vnet.ibm.com>
> ---
> drivers/scsi/ipr.c | 16 ++++++++++++++--
> drivers/scsi/ipr.h | 1 +
> 2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
> index 1f539c2..21b6da6 100644
> --- a/drivers/scsi/ipr.c
> +++ b/drivers/scsi/ipr.c
> @@ -100,6 +100,7 @@ static unsigned int ipr_max_devs =
IPR_DEFAULT_SIS64_DEVS;
> static unsigned int ipr_dual_ioa_raid = 1;
> static unsigned int ipr_number_of_msix = 16;
> static unsigned int ipr_fast_reboot;
> +static unsigned int ipr_use_blk_mq = 0;
Why do we disable this by default?
Thanks,
Brian
--
Brian King
Power Linux I/O
IBM Linux Technology Center
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