linux-kernel - Re: [PATCH] nvme-multipath: implement active-active round-robin path selector

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Date:   Wed, 4 Apr 2018 15:36:45 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Christoph Hellwig <hch@....de>, Baegjae Sung <baegjae@...il.com>
Cc:     keith.busch@...el.com, axboe@...com,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme-multipath: implement active-active round-robin path
 selector


> For PCIe devices the right policy is not a round robin but to use
> the pcie device closer to the node.  I did a prototype for that
> long ago and the concept can work.  Can you look into that and
> also make that policy used automatically for PCIe devices?

I think that active/active makes sense for fabrics (link throughput
aggregation) but also for dual-ported pci devices (given that
this is a real use-case).

I agree that the default can be a home-node path selection.