netdev - Re: tx checksum offload in rtl8168evl disabled in driver

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Message-ID: <20131003230120.GA25047@electric-eye.fr.zoreil.com>
Date:	Fri, 4 Oct 2013 01:01:20 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	jason.morgan@...illant.com
Cc:	netdev@...r.kernel.org, hayeswang@...ltek.com
Subject: Re: tx checksum offload in rtl8168evl disabled in driver

jason.morgan@...illant.com <jason.morgan@...illant.com> :
[...]
> I'm at 517Mbps and I've found that there seems to be a cpu bottleneck.

Which kernel ?

> I'm using 2k to 4k frames with a rtl8168evl.
> I've found this message
> http://www.spinics.net/lists/netdev/msg216530.html
[...]
> However the message thread, above indicates that this is not a problem and 
> can be changed to make tx-checksum offload possible.
> 
> However we are using a newer chip to the on in the message thread.  I've 
> tried to find other, more recent citations without success.
> 
> So, why is it still turned off ?

It has been disabled since d58d46b5d85139d18eb939aa7279c160bab70484 ("r8169:
jumbo fixes"). Patch was submitted as a RFC on 2011/07/17 and Hayes was
explicitely requested to comment on the jumbo part if necessary. Patch was
submitted for inclusion on 2011/09/22.

Tx checksumming and jumbo are mutually exclusive in Realtek's driver as well.

It seems no recent gigabit chipset reliably supports it.

> What will be the effect of turning it on (changing false to true, in the 
> driver line) for our chip ?

YMMV.

Hayes may elaborate.

-- 
Ueimor
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