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Date:      Sat, 23 Sep 2017 08:37:30 +0000
From:      "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
To:        "Stephen Hurd" <shurd@sasktel.net>
Cc:        "Stephen Hurd" <shurd@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r323942 - head/sys/net
Message-ID:  <6F5DC92C-2CF6-4A33-9663-BFECB7DB65F2@lists.zabbadoz.net>
In-Reply-To: <283397c7-a01e-3776-7ed3-b64d68003d0b@sasktel.net>
References:  <201709230135.v8N1ZE6S063264@repo.freebsd.org> <B28D9879-4ECF-43E4-9A58-51F616CEC4BE@lists.zabbadoz.net> <283397c7-a01e-3776-7ed3-b64d68003d0b@sasktel.net>

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On 23 Sep 2017, at 6:32, Stephen Hurd wrote:

> Bjoern A. Zeeb wrote:
>> On 23 Sep 2017, at 1:35, Stephen Hurd wrote:
>>
>>> Author: shurd
>>> Date: Sat Sep 23 01:35:14 2017
>>> New Revision: 323942
>>> URL: https://svnweb.freebsd.org/changeset/base/323942
>>>
>>> Log:
>>>    Chain mbufs before passing to if_input()
>>>
>>>    Build a list of mbufs to pass to if_input() after LRO. Results in
>>>    12% small packet forwarding rate improvement.
>> forwarding seems a confusing word here..
>
> The test was small (64 byte frames) received on one interface, then 
> sent out on a different one using the net.inet.ip.forwarding sysctl 
> (controlled via the gateway_enable setting in rc.conf).

Then this makes no sense as we don’t do LRO if forwarding is enabled 
on the machine;
https://svnweb.freebsd.org/base/head/sys/netinet/tcp_lro.c?annotate=317390#l645





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