Date: Fri, 26 Oct 2018 17:11:22 +0300 From: Lev Serebryakov <lev@FreeBSD.org> To: freebsd-net@freebsd.org Subject: Re: What are conditions to spread traffic across different NIC queues? Message-ID: <370ccdb0-cb71-a4da-0a35-4e878eb6ba1c@FreeBSD.org> In-Reply-To: <cbcadec2-bf74-a1a9-2c66-97d9d409907f@FreeBSD.org> References: <cbcadec2-bf74-a1a9-2c66-97d9d409907f@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --zsTDxegmtOkjDLOAyKz15qm2TtvkcDoZs Content-Type: multipart/mixed; boundary="JnkhyfEJCborJK29zf4YjbG7OBNpdpkP0"; protected-headers="v1" From: Lev Serebryakov <lev@FreeBSD.org> Reply-To: lev@FreeBSD.org To: freebsd-net@freebsd.org Message-ID: <370ccdb0-cb71-a4da-0a35-4e878eb6ba1c@FreeBSD.org> Subject: Re: What are conditions to spread traffic across different NIC queues? References: <cbcadec2-bf74-a1a9-2c66-97d9d409907f@FreeBSD.org> In-Reply-To: <cbcadec2-bf74-a1a9-2c66-97d9d409907f@FreeBSD.org> --JnkhyfEJCborJK29zf4YjbG7OBNpdpkP0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 26.10.2018 15:30, Lev Serebryakov wrote: > I have "router" with two em (82574L) NICs. It has dual-core CPU and > each NIC creates two receive and two transmit queues: >=20 > $ sysctl dev.em | grep queue | grep _irq > dev.em.1.queue_rx_1.rx_irq: 0 > dev.em.1.queue_rx_0.rx_irq: 0 > dev.em.1.queue_tx_1.tx_irq: 0 > dev.em.1.queue_tx_0.tx_irq: 0 > dev.em.0.queue_rx_1.rx_irq: 0 > dev.em.0.queue_rx_0.rx_irq: 0 > dev.em.0.queue_tx_1.tx_irq: 0 > dev.em.0.queue_tx_0.tx_irq: 0 > $ >=20 > When I pass, say, 64 UDP streams through this router, only one core is= > 100% loaded and other is 100% idle. These streams are for same IP pair,= > but port pairs are all different. >=20 > What are right conditions to spread such traffic per queues and cores?= Ok, 82574L is "low end" chip, it supports only IP and IP+TCP checksums. 82576EB supports IP+UDP too. Intel, what is wrong with you?! --=20 // Lev Serebryakov --JnkhyfEJCborJK29zf4YjbG7OBNpdpkP0-- --zsTDxegmtOkjDLOAyKz15qm2TtvkcDoZs Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE+W0coLX0MYtnSzMK6rA8WL/cR48FAlvTIIpfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEY5 NkQxQ0EwQjVGNDMxOEI2NzRCMzMwQUVBQjAzQzU4QkZEQzQ3OEYACgkQ6rA8WL/c R49FPw/+PPrDOPr3AU+/6mnP25teVQmXRDaO3WsiVLf83YEWX4n9JnIkz0e6nmrH ObCIVfO/Cf6k2g05Tyq58kgRfDHJMTdhKm0RXDcZIEbRr9O/S6Un6CbzCVMwSWYt AvMuLdp7Lr0xp9Q7eSL+hZ80RRSEIfayM1SCNtkuBve0jDs9kuelCcv54mEwtkbz aNAHdfP/NmIeS+5MaKniCi1kcstSVWOpg9SuNLLrh1NtQlUSflhETsZNl2b7NGJj gKVs6pJbwRxBlq3CBQwVxGzfcp1webwQXvPyTpzrrEvJ+BqPOsOHAf8BMdZgutiA G+GjSYDXN3KYIyZcRuM3fKyP53pzw0tReLrwfHl1o3WHXGOLAkXlhw1h0T3YVcHH RGPv9ODtcIO6Cwatyums0kmAjlWq2MJLFcQP/sThoQDIZhFi5cLf9fCO75/1XHuS 1Iaek1JLaBeiFjqd427LU5XFglx7wOerIsd+Gjf6LTagbPsilSDWkhTxLVxzwTyI I/fmqkiRgI4w0gUJuglPhtkkBjizic8OKxHPG65t2VXFiLr5iVtB7AqWBNDXGNLK tRtkMdpXQhTWeuOSwkJO5VCkYjff859t+f6UHVZIMW2n7B6804cWhfd9BVMOszUf W1le5GJqDsF7ISZlN5a8bEzspgH75mjhxwmfXPeX9SX1m8W1xNI= =S3Jj -----END PGP SIGNATURE----- --zsTDxegmtOkjDLOAyKz15qm2TtvkcDoZs--
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