linux-kernel - Re: [PATCH v6 6/6] nvme: repack struct nvme_ns

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Date: Tue, 19 Dec 2023 12:59:29 +0100
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Max Gurtovoy <mgurtovoy@...dia.com>,
 Chaitanya Kulkarni <chaitanyak@...dia.com>
Subject: Re: [PATCH v6 6/6] nvme: repack struct nvme_ns_head

On 12/18/23 17:59, Daniel Wagner wrote:
> ns_id, lba_shift and ms are always accessed for every read/write I/O in
> nvme_setup_rw. By grouping these variables into one cacheline we can
> safe some cycles.
> 
> 4k sequential reads:
> 
>             baseline   patched
> Bandwidth: 1620       1634
> IOPs       66345579   66910939
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/nvme.h | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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