linux-kernel - Re: [PATCH v4 4/4] nvme: repack struct nvme_ns

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Message-ID: <20231207153351.GC21486@lst.de>
Date:   Thu, 7 Dec 2023 16:33:51 +0100
From:   Christoph Hellwig <hch@....de>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH v4 4/4] nvme: repack struct nvme_ns_head

On Thu, Dec 07, 2023 at 01:36:24PM +0100, 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

Nice:

Reviewed-by: Christoph Hellwig <hch@....de>