informatique:linux:reseau
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informatique:linux:reseau [2020/12/06 19:33] pteu Activer le TCP BBR |
informatique:linux:reseau [2021/01/31 16:40] (current) pteu Diagnostique |
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| * [[https://www.kernel.org/doc/Documentation/networking/bonding.txt|Linux Ethernet Bonding Driver HOWTO]] sur kernel.org | * [[https://www.kernel.org/doc/Documentation/networking/bonding.txt|Linux Ethernet Bonding Driver HOWTO]] sur kernel.org | ||
| * [[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-using_channel_bonding|Using Channel Bonding]] (Redhat.com) | * [[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-using_channel_bonding|Using Channel Bonding]] (Redhat.com) | ||
| + | |||
| + | =====Diagnostique===== | ||
| + | |||
| + | Afficher les infos gloables de la carte réseau: | ||
| + | <code bash> | ||
| + | ifconfig eno0 | ||
| + | eno0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 | ||
| + | inet 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.254 | ||
| + | inet6 fe80::1 prefixlen 64 scopeid 0x20<link> | ||
| + | ether 00:11:22:33:44:55 txqueuelen 1000 (Ethernet) | ||
| + | RX packets 145863345 bytes 51112594452 (47.6 GiB) | ||
| + | RX errors 0 dropped 101954 overruns 0 frame 0 | ||
| + | TX packets 172043044 bytes 222388343673 (207.1 GiB) | ||
| + | TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 | ||
| + | device interrupt 16 memory 0x80400000-80420000 | ||
| + | </code> | ||
| + | Ici on voit un problème de paquets supprimés (dropped). | ||
| + | |||
| + | Afficher les statistiques de la carte (les compteurs plus précis) : | ||
| + | <code bash> | ||
| + | ethtool -S eth0 | ||
| + | NIC statistics: | ||
| + | rx_packets: 145743003 | ||
| + | tx_packets: 171911063 | ||
| + | rx_bytes: 51104241565 | ||
| + | tx_bytes: 222190909954 | ||
| + | rx_broadcast: 9278170 | ||
| + | tx_broadcast: 50 | ||
| + | rx_multicast: 3348219 | ||
| + | tx_multicast: 8 | ||
| + | rx_errors: 0 | ||
| + | tx_errors: 0 | ||
| + | tx_dropped: 0 | ||
| + | multicast: 3348219 | ||
| + | collisions: 0 | ||
| + | rx_length_errors: 0 | ||
| + | rx_over_errors: 0 | ||
| + | rx_crc_errors: 0 | ||
| + | rx_frame_errors: 0 | ||
| + | rx_no_buffer_count: 708691 | ||
| + | rx_missed_errors: 101954 | ||
| + | tx_aborted_errors: 0 | ||
| + | tx_carrier_errors: 0 | ||
| + | tx_fifo_errors: 0 | ||
| + | tx_heartbeat_errors: 0 | ||
| + | tx_window_errors: 0 | ||
| + | tx_abort_late_coll: 0 | ||
| + | tx_deferred_ok: 0 | ||
| + | tx_single_coll_ok: 0 | ||
| + | tx_multi_coll_ok: 0 | ||
| + | tx_timeout_count: 0 | ||
| + | tx_restart_queue: 0 | ||
| + | rx_long_length_errors: 0 | ||
| + | rx_short_length_errors: 0 | ||
| + | rx_align_errors: 0 | ||
| + | tx_tcp_seg_good: 0 | ||
| + | tx_tcp_seg_failed: 0 | ||
| + | rx_flow_control_xon: 0 | ||
| + | rx_flow_control_xoff: 0 | ||
| + | tx_flow_control_xon: 0 | ||
| + | tx_flow_control_xoff: 0 | ||
| + | rx_csum_offload_good: 132050209 | ||
| + | rx_csum_offload_errors: 284 | ||
| + | rx_header_split: 0 | ||
| + | alloc_rx_buff_failed: 0 | ||
| + | tx_smbus: 0 | ||
| + | rx_smbus: 0 | ||
| + | dropped_smbus: 0 | ||
| + | rx_dma_failed: 0 | ||
| + | tx_dma_failed: 0 | ||
| + | rx_hwtstamp_cleared: 0 | ||
| + | uncorr_ecc_errors: 0 | ||
| + | corr_ecc_errors: 0 | ||
| + | tx_hwtstamp_timeouts: 0 | ||
| + | tx_hwtstamp_skipped: 0 | ||
| + | </code> | ||
| + | Le compteur rx_missed_errors indique des paquets perdus ; la cause est souvent le tampon réseau qui est saturé, car trop de paquets reçus en même temps (à cause de burst, voir contrôle de flux), ou CPU trop lente/chargée pour les traiter. | ||
| + | |||
| + | Il peut être utile d'augmenter la taille des buffers et de faire des tests ; en gardant à l'esprit que cela augmente aussi la latence : | ||
| + | <code bash> | ||
| + | # afficher les paramètres actuels et les max admis | ||
| + | ethtool -g eno0 | ||
| + | Ring parameters for eno0: | ||
| + | Pre-set maximums: | ||
| + | RX: 4096 | ||
| + | RX Mini: 0 | ||
| + | RX Jumbo: 0 | ||
| + | TX: 4096 | ||
| + | Current hardware settings: | ||
| + | RX: 256 | ||
| + | RX Mini: 0 | ||
| + | RX Jumbo: 0 | ||
| + | TX: 256 | ||
| + | |||
| + | # augmenter les buffers rx/tx | ||
| + | ethtool -G eno0 rx 4096 tx 4096 | ||
| + | </code> | ||
| =====Tips===== | =====Tips===== | ||
informatique/linux/reseau.txt · Last modified: 2021/01/31 16:40 by pteu
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