[DragonFlyBSD - Bug #3089] (In Progress) vtnet(4) - disable TCP checksum offload by default

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Sun Oct 22 02:29:04 PDT 2017

Issue #3089 has been updated by vadaszi.

Status changed from New to In Progress
Assignee set to vadaszi

Bug #3089: vtnet(4) - disable TCP checksum offload by default

* Author: jlane
* Status: In Progress
* Priority: Normal
* Assignee: vadaszi
* Category: Driver
* Target version: 5.0.0
The existing TCP checksum offset for this driver causes ~95% retransmit rates for TCP IPv6 packets.  This makes the driver effectively useless in its current state on IPv6 networks.  Fixing the checksum offload code is beyond my expertise at this time, so we should at least disable the offload by default.

Patch for sys/dev/virtual/virtio/net/if_vtnet.c:

< static int vtnet_csum_disable = 0;
> static int vtnet_csum_disable = 1; //broken for IPv6, disable by default

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