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Mon, 28 Aug 2023 07:32:36 +0000 From: Wei Hu To: "freebsd-hackers@FreeBSD.org" CC: "freebsd-net@FreeBSD.org" Subject: Very slow scp performance comparing to Linux Thread-Topic: Very slow scp performance comparing to Linux Thread-Index: AdnZfvJbaS4mlPy2QcSWspi9tSFg8Q== Date: Mon, 28 Aug 2023 07:32:35 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=c0bd6cc2-296c-4e45-ab32-f5c2dce362b4;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2023-08-28T07:11:28Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SI2P153MB0441:EE_|SEZP153MB0791:EE_ x-ms-office365-filtering-correlation-id: f3c5db47-01c9-41fa-5405-08dba798f2df x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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WHITELIST_SPF_DKIM(-3.00)[microsoft.com:d:+,microsoft.com:s:+]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; DWL_DNSWL_LOW(-1.00)[microsoft.com:dkim]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.999]; DMARC_POLICY_ALLOW(-0.50)[microsoft.com,reject]; R_SPF_ALLOW(-0.20)[+ip4:40.107.0.0/16]; R_DKIM_ALLOW(-0.20)[microsoft.com:s=selector2]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:8075, ipnet:40.104.0.0/14, country:US]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org,freebsd-net@freebsd.org]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[40.107.215.105:from]; FROM_HAS_DN(0.00)[]; TO_DN_EQ_ADDR_ALL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[microsoft.com:+]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.107.215.105:from] X-Spamd-Bar: -------- X-Rspamd-Queue-Id: 4RZ2Mb35C3z3CWY Hi, When I was testing a new NIC, I found the single stream scp performance was= almost 8 time slower than Linux on the RX side. Initially I thought it mig= ht be something with the NIC. But when I switched to sending the file on lo= calhost, the numbers stay the same.=20 Here I was sending a 2GB file from sender to receiver using scp. FreeBSD i= s a recent NON-DEBUG build from CURRENT. The Ubuntu Linux kernel is 6.2.0. = Both run in HyperV VMs on the same type of hardware. The FreeBSD VM has 16 = vcpus, while Ubuntu VM has 4 vcpu. Sender Receiver throughput Linux FreeBSD 70 MB/s Linux Linux 550 MB/s FreeBSD FreeBSD 70 MB/s FreeBSD Linux 350 MB/s FreeBSD localhost 70 MB/s Linux localhost 550 MB/s >From theses test, it seems I can rule out the issue on NIC and its driver. = Looks the FreeBSD kernel network stack is much slower than Linux on single = stream TCP, or there are some problem with scp? I also tried turning on following kernel parameters on FreeBSD kernel. But = it makes no difference, neither do the other tcp cc algorithms such as htcp= and newreno. net.inet.tcp.soreceive_stream=3D"1" net.isr.maxthreads=3D"-1" net.isr.bindthreads=3D"1" net.inet.ip.intr_queue_maxlen=3D2048 net.inet.tcp.recvbuf_max=3D16777216 net.inet.tcp.recvspace=3D419430 net.inet.tcp.sendbuf_max=3D16777216 net.inet.tcp.sendspace=3D209715 kern.ipc.maxsockbuf=3D16777216 Any ideas? Thanks, Wei