linux-kernel - Re: [PATCH v2 2/3] nvme-tcp: support specifying the congestion-control

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Date:   Wed, 30 Mar 2022 15:31:17 +0800
From:   Mingbao Sun <sunmingbao@....com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Sagi Grimberg <sagi@...mberg.me>, Keith Busch <kbusch@...nel.org>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Chaitanya Kulkarni <kch@...dia.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        tyler.sun@...l.com, ping.gan@...l.com, yanxiu.cai@...l.com,
        libin.zhang@...l.com, ao.sun@...l.com
Subject: Re: [PATCH v2 2/3] nvme-tcp: support specifying the
 congestion-control

On Mon, 28 Mar 2022 21:33:53 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Tue, 29 Mar 2022 10:48:06 +0800 Mingbao Sun wrote:
> > A server in a data-center with the following 2 NICs:
> > 
> >     - NIC_fron-end, for interacting with clients through WAN
> >       (high latency, ms-level)
> > 
> >     - NIC_back-end, for interacting with NVMe/TCP target through LAN
> >       (low latency, ECN-enabled, ideal for dctcp)
> > 
> > This server interacts with clients (handling requests) via the fron-end
> > network and accesses the NVMe/TCP storage via the back-end network.
> > This is a normal use case, right?  
> 
> Well, if you have clearly separated networks you can set the congestion
> control algorithm per route, right? man ip-route, search congctl.

Cool, many thanks for the education.

I verified this approach, and it did work well.
And I furtherly found the commit
‘net: tcp: add per route congestion control’ which just
addresses the requirement of this scenario (separated network).

So with this approach, the requirements of our use case are
roughly satisfied.

Thanks again ^_^