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

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Date:   Fri, 25 Mar 2022 22:46:54 +0800
From:   Mingbao Sun <sunmingbao@....com>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     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>,
        Jakub Kicinski <kuba@...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

Hope the 3 combinations can support the claims in the commit message.

Since for the later 2 combinations, due to packet dropping and
timeout-retransmission, the bandwidth of each TX node could suddenly
drop a few hundred MB/S. 
And on the RX node, the total bandwidth can not reach to the full link
bandwidth (which is about 6 GB/S).
.
In contrast, for the first combination, the bandwidth of each TX node
is stable at ~ 2GB/S.
And on the RX node, the total bandwidth reached to the full link bandwidth.
And no packet dropping occurs on the 2 switches.
This is even competitive to the performance of RDMA.