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[45.32.91.63]) by smtp.gmail.com with ESMTPSA id u34-20020a056a0009a200b006b73af176c7sm6659971pfg.157.2023.11.20.17.40.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 Nov 2023 17:40:10 -0800 (PST) From: Zhenlei Huang X-Google-Original-From: Zhenlei Huang Content-Type: text/plain; charset=us-ascii List-Id: Discussions List-Archive: https://lists.freebsd.org/archives/freebsd-transport List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-transport@freebsd.org X-BeenThere: freebsd-transport@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.4\)) Subject: Re: Low performance of BBR compared to cubic In-Reply-To: Date: Tue, 21 Nov 2023 09:40:05 +0800 Cc: Richard Scheffenegger , Cheng Cui Content-Transfer-Encoding: quoted-printable Message-Id: <28C78288-6469-4D39-A3A4-39D7848BA319@FreeBSD.org> References: To: freebsd-transport@freebsd.org X-Mailer: Apple Mail (2.3696.120.41.1.4) X-Spamd-Result: default: False [-2.50 / 15.00]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_MATCH_TO(1.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; MV_CASE(0.50)[]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20230601]; MIME_GOOD(-0.10)[text/plain]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::231:from]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; TAGGED_FROM(0.00)[]; MLMMJ_DEST(0.00)[freebsd-transport@freebsd.org]; DKIM_TRACE(0.00)[gmail.com:+]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_SOME(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_COUNT_TWO(0.00)[2] X-Rspamd-Queue-Id: 4SZ6Wc2kLZz3CZW X-Spamd-Bar: -- I forgot to subscribe #transport mailing list and missed some replies. > On Nov 19, 2023, at 3:37 AM, Zhenlei Huang wrote: >=20 > Hi, >=20 > While test TCP RACK functions, I tested BBR BTW. >=20 > This is a quick test with iperf3 on bare metal ( old MBP i5 2 cores 4 = threads ). Forgot to mention that test is done with lo0, one thread only. `iperf3 -s` and `iperf3 -c 127.0.0.1` I would prefer that as a baseline. Generally it should be good enough, since there's no congestion or loss, = and the bottleneck will always be CPU . > The kernel current/15 with debug options disabled. Following is the = performance result: >=20 > freebsd: 37.2 Gbits/sec 1.32 MBytes > RACK: 27.9 Gbits/sec 1.34 MBytes > BBR: 2.34 Gbits/sec 223 KBytes >=20 > For freebsd and RACK functions the CC is cubic. >=20 > The last column is Cwnd. BBR's Cwnd looks quite small. >=20 > There's also a report on Telegram Taiwan FreeBSD chat group, but = without performance details. >=20 > I believe there is something wrong with BBR. This is not a reasonable = good performance compared with > other tcp congestion control algorithms. >=20 > Or am I missing something ? >=20 > Best regards, > Zhenlei >=20