Dotaz: Ubuntu - jumbo frames - MTU 9000

[Marek]

Mam 2 sitove karty v bondu (LACP) nad kterymi bezi vlany

/etc/network/interfaces

auto bond0 iface bond0 inet manual slaves eth0 eth1

Pokud pridam: 1) MTU 9000 --- nic se nestane 2) MTU=9000 --- networking se nenastartuje

Po nabehu serveru se da mtu nastavit bez problemu pomoci ifconfig bond0 bond0 a podobne i pro jednu z vlan. Jak to nastavit do ..interfaces aby to fungovalo?

Dalsi otazka zni obecne ohledne jumbo frames/mtu 9000:

Ping standardniho 64byte paketu:

64 bytes from 10.20.0.10: icmp_seq=1 ttl=255 time=0.067 ms 64 bytes from 10.20.0.10: icmp_seq=2 ttl=255 time=0.083 ms 64 bytes from 10.20.0.10: icmp_seq=3 ttl=255 time=0.081 ms

Ping jumbo packetu: 8008 bytes from 10.20.0.10: icmp_seq=1 ttl=255 time=0.491 ms 8008 bytes from 10.20.0.10: icmp_seq=2 ttl=255 time=0.487 ms 8008 bytes from 10.20.0.10: icmp_seq=3 ttl=255 time=0.486 ms

Je ten narust odezvy ok?

Odpovědi

[NN]

K cemu pouzivat nestandartni MTU, to su akorat koledujes o problemy.

NN

[Marek]

k cemu pouzivat nestandartni MTU? --- iSCSI

[kyytaM]

Narast je ok, vsak vysielas viac ako 10x tolko dat a narast je okolo 5x. ;) Cas prenosou po kabli je rovnaky, aj cas spracovania v sietovom stacku na stroji (zhruba), ale narast latencie nastava prave pri vysielani paketu (a prijimani).