svn commit: r327559 - in head: . sys/net

Eugene Grosbein eugen at grosbein.net
Thu Jan 4 20:50:47 UTC 2018


05.01.2018 3:05, Steven Hartland wrote:

> Author: smh
> Date: Thu Jan  4 20:05:47 2018
> New Revision: 327559
> URL: https://svnweb.freebsd.org/changeset/base/327559
> 
> Log:
>   Disabled the use of flowid for lagg by default
>   
>   Disabled the use of RSS hash from the network card aka flowid for
>   lagg(4) interfaces by default as it's currently incompatible with
>   the lacp and loadbalance protocols.
>   
>   The incompatibility is due to the fact that the flowid isn't know
>   for the first packet of a new outbound stream which can result in
>   the hash calculation method changing and hence a stream being
>   incorrectly split across multiple interfaces during normal
>   operation.
>   
>   This can be re-enabled by setting the following in loader.conf:
>   net.link.lagg.default_use_flowid="1"
>   
>   Discussed with: kmacy
>   Sponsored by:	Multiplay

RSS by definition has meaning to received stream. What is "outbound" stream
in this context, why can the hash calculatiom method change and what exactly
does it mean "a stream being incorrectly split"?

Defaults should not be changed so easily just because they are not optimal
for some specific case. Each lagg has its own setting for flowid usage
and why one cannot just use "ifconfig lagg0 -use_flowid" for such cases?




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