netdev - Re: [net-next v2 11/12] i40e/i40evf: carefully fill tx ring

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Date:	Sun, 09 Mar 2014 19:52:11 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, Jesse Brandeburg <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com,
	Catherine Sullivan <catherine.sullivan@...el.com>
Subject: Re: [net-next v2 11/12] i40e/i40evf: carefully fill tx ring

On Thu, 2014-03-06 at 18:59 -0800, Jeff Kirsher wrote:
> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> We need to make sure that we stay away from the cache line
> where the DD bit (done) may be getting written back for
> the transmit ring since the hardware may be writing the
> whole cache line for a partial update.
[...]

This seems like quite a serious bug.  Is it not important enough for net
& stable updates?  

Ben.

-- 
Ben Hutchings
I say we take off; nuke the site from orbit.  It's the only way to be sure.

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