linux-kernel - Re: [PATCH v3] nvme-pci: Support shared tags across queues for Apple 2018 controllers

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Date:   Tue, 06 Aug 2019 15:24:19 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Paul Pawlowski <paul@...rm.io>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Damien Le Moal <Damien.LeMoal@....com>
Subject: Re: [PATCH v3] nvme-pci: Support shared tags across queues for
 Apple 2018 controllers

On Mon, 2019-08-05 at 07:49 -0600, Keith Busch wrote:
> > Ping ? I had another look today and I don't feel like mucking around
> > with all the AQ size logic, AEN magic tag etc... just for that sake of
> > that Apple gunk. I'm happy to have it give up IO tags, it doesn't seem
> > to make much of a difference in practice anyway.
> > 
> > But if you feel strongly about it, then I'll implement the "proper" way
> > sometimes this week, adding a way to shrink the AQ down to something
> > like 3 (one admin request, one async event (AEN), and the empty slot)
> > by making a bunch of the constants involved variables instead.
> 
> I don't feel too strongly about it. I think your patch is fine, so
> 
> Acked-by: Keith Busch <keith.busch@...el.com>

Thanks, I'll fold the test and respin this week.

Cheers,
Ben.