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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.
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