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Date:   Fri, 16 Nov 2018 08:40:28 -0800
From:   Omar Sandoval <>
To:     Christoph Hellwig <>
Cc:     Ming Lei <>, Jens Axboe <>,,,, Dave Chinner <>,
        Kent Overstreet <>,
        Mike Snitzer <>,,
        Alexander Viro <>,, Shaohua Li <>,,,
        David Sterba <>,,
        "Darrick J . Wong" <>,, Gao Xiang <>,
        Theodore Ts'o <>,,
        Coly Li <>,,
        Boaz Harrosh <>,
        Bob Peterson <>,
Subject: Re: [PATCH V10 18/19] block: kill QUEUE_FLAG_NO_SG_MERGE

On Fri, Nov 16, 2018 at 02:59:22PM +0100, Christoph Hellwig wrote:
> On Thu, Nov 15, 2018 at 06:18:11PM -0800, Omar Sandoval wrote:
> > This commit message wasn't very clear. Is it the case that
> > QUEUE_FLAG_NO_SG_MERGE is no longer set by any drivers?
> I think he wants to say that not doing S/G merging is rather pointless
> with the current setup of the I/O path, as it isn't going to save
> you a significant amount of cycles.

Okay, that makes sense. Ming, you can add

Reviewed-by: Omar Sandoval <>

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