netdev - Re: [net PATCH] i40e/i40evf: Limit TSO to 7 descriptors for payload instead of 8 per packet

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Date:	Wed, 30 Mar 2016 13:20:01 -0400
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	Alexander Duyck <aduyck@...antis.com>,
	Netdev <netdev@...r.kernel.org>,
	intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: [net PATCH] i40e/i40evf: Limit TSO to 7 descriptors for payload
 instead of 8 per packet

On (03/30/16 10:12), Alexander Duyck wrote:
> Yeah.  The patch was sort of a knee-jerk reaction to being told that
> the patch referenced caused a regression.  From what I can tell that
> is not the case as I am also seeing the Tx hangs when I run the test
> with the frames being linearized.

I'm not sure how important of a subtlety this is, but the actual
console log after the patch is the following:

 i40e 0000:82:00.0: TX driver issue detected, PF reset issued
 i40e 0000:82:00.0 eth2: adding 68:05:ca:30:dd:18 vid=0
 i40e 0000:82:00.0: TX driver issue detected, PF reset issued
 i40e 0000:82:00.0 eth2: adding 68:05:ca:30:dd:18 vid=0
 i40e 0000:82:00.0: TX driver issue detected, PF reset issued

Comparing with what I'd pasted in the sourceforge thread earlier,
I see that it does not say "Hung Tx queue etc."  any more, though
it still resets.

Not sure if that changed info is significant?

--Sowmini