linux-kernel - Re: [PATCH] iosched: Add i10 I/O Scheduler

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Message-ID: <cbe18a3d-8a6b-e775-81bb-3b3f11045183@grimberg.me>
Date:   Fri, 13 Nov 2020 13:36:16 -0800
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Jens Axboe <axboe@...nel.dk>, Rachit Agarwal <rach4x0r@...il.com>,
        Christoph Hellwig <hch@....de>
Cc:     linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Jaehyun Hwang <jaehyun.hwang@...nell.edu>,
        Qizhe Cai <qc228@...nell.edu>,
        Midhul Vuppalapati <mvv25@...nell.edu>,
        Rachit Agarwal <ragarwal@...cornell.edu>,
        Sagi Grimberg <sagi@...htbitslabs.com>,
        Rachit Agarwal <ragarwal@...nell.edu>
Subject: Re: [PATCH] iosched: Add i10 I/O Scheduler


>> But if you think this has a better home, I'm assuming that the guys
>> will be open to that.
> 
> Also see the reply from Ming. It's a balancing act - don't want to add
> extra overhead to the core, but also don't want to carry an extra
> scheduler if the main change is really just variable dispatch batching.
> And since we already have a notion of that, seems worthwhile to explore
> that venue.

I agree,

The main difference is that this balancing is not driven from device
resource pressure, but rather from an assumption of device specific
optimization (and also with a specific optimization target), hence a
scheduler a user would need to opt-in seemed like a good compromise.

But maybe Ming has some good ideas on a different way to add it..