DPDK: kernel: [155631.653203] packet size is too long (3554 > 1518) seen when vhost has jumbo mtu

Bug #1694343 reported by Vinod Nair
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Juniper Openstack
Won't Fix
Medium
Kiran
R4.0
Won't Fix
Medium
Kiran
R4.1
Won't Fix
Medium
Kiran
Trunk
Won't Fix
Medium
Kiran

Bug Description

With nets such as with lbaas , when vhost0 has jumbo mtu see below messages in syslog

May 29 16:46:59 cs-scale-02 kernel: [155631.589963] packet size is too long (3554 > 1518)
May 29 16:46:59 cs-scale-02 kernel: [155631.625381] packet size is too long (2962 > 1518)
May 29 16:46:59 cs-scale-02 kernel: [155631.644056] packet size is too long (3554 > 1518)
May 29 16:46:59 cs-scale-02 kernel: [155631.653203] packet size is too long (3554 > 1518)

Revision history for this message
Vinod Nair (vinodnair) wrote :

Linux AF pkt driver currently doesn't support jumbo mtu . If netns is used like in snat or lbaas , vhost mtu cannot be set to jumbo

tags: added: releasenote
Revision history for this message
Kiran (kiran-kn80) wrote :

Can't change the MTU to more than 1500. It's limitation of af_packet driver in linux. Release note.

Revision history for this message
Jeba Paulaiyan (jebap) wrote :

Release-Notes:

    In DPDK vrouter use-cases that requires netns to be launched (SNAT, LBaaS), do not set Jumbo frames. Use MTU <= 1500 bytes.

information type: Proprietary → Public
Revision history for this message
Kiran (kiran-kn80) wrote :

This is RELNOTE

Revision history for this message
Jeba Paulaiyan (jebap) wrote :

If we are not going to fix this at all, please mark Wont Fix with comments.

Revision history for this message
Kiran (kiran-kn80) wrote :

Jeba, pl check comment #2

Kiran (kiran-kn80)
Changed in juniperopenstack:
status: New → Won't Fix
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