netdev - Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are enabled

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Date:	Sun, 9 Mar 2014 01:56:18 -0500
From:	Ming Chen <v.mingchen@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	Erez Zadok <ezk@....cs.sunysb.edu>,
	Dean Hildebrand <dhildeb@...ibm.com>,
	Geoff Kuenning <geoff@...hmc.edu>
Subject: Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are enabled

On Sat, Mar 8, 2014 at 10:52 PM, John Fastabend
<john.fastabend@...il.com> wrote:
>
> The NIC by default will round robin amongst the queues and should be
> reasonably fair. We could increase the number of TX queues the driver
> enables and for a small number of flows the first condition is easier
> to meet. Although it wont help as the flow count increases.

Yes, it is definitely better to be capable of using all tx queues.
>From a customer's point of view, if someone bought an NIC with 64
queues, then the vendor (and the NIC driver) should enable him/her to
use all queues if the customer really want to.

In our case, we believe larger number of tx queues will reduce the
probability of hash collision.

Thanks,
Ming
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