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Date:   Sat, 29 Oct 2016 16:18:57 -0700
From:   Brenden Blanco <>
To:     Alexei Starovoitov <>
Cc:     Tariq Toukan <>,
        "David S. Miller" <>,,
        Eran Ben Elisha <>
Subject: Re: [PATCH net-next 2/2] net/mlx4_en: Refactor the XDP forwarding
 rings scheme

On Thu, Oct 27, 2016 at 06:07:02PM -0700, Alexei Starovoitov wrote:
> On Thu, Oct 27, 2016 at 05:52:04PM +0300, Tariq Toukan wrote:
> > Separately manage the two types of TX rings: regular ones, and XDP.
> > Upon an XDP set, do not borrow regular TX rings and convert them
> > into XDP ones, but allocate new ones, unless we hit the max number
> > of rings.
> > Which means that in systems with smaller #cores we will not consume
> > the current TX rings for XDP, while we are still in the num TX limit.
> The commit log is too scarce for details...
> So questions:
> - Did you test with changing the number of channels after xdp prog is loaded?
> That was the recent bug that Brenden fixed.
> - does it still have 256 tx queue limit or xdp tx rings can go over?
> - Any performance implications ?
> Brenden, could you please review this patch?
Sure, sorry for the delay...was traveling.

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