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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAG+wggY+Ya1ehtAF9ZF=wkq7aQ9jgsQOB-Nj0ZwQhJWTMs3PQA@mail.gmail.com>
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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html