netdev - Re: [PATCH net-next-2.6] macvlan: add multiqueue capability

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: <4AA00AA1.6040504@trash.net>
Date:	Thu, 03 Sep 2009 20:27:45 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] macvlan: add multiqueue capability

Eric Dumazet wrote:
> Patrick McHardy a écrit :
>> The patch looks fine, but it just occured to me that this won't
>> have any effect since both VLAN and macvlan use a tx_queue_len of 0,
>> so they will by default have queueing disabled. In fact this
>> will increase costs for the default case since we're now hashing
>> every packet.
> 
> Just read again dev_queue_xmit(), in case we have no queueing
> on macvlan/vlan
> 
> Having mutiple txq should help multi flow / multi cpus setups,
> since hashing will provide more chances to hit different txq/locks,
> and let several cpus run concurrently, each one on a different queue.

You're right, I missed that we're also perfoming locking in the
noqueue case. Sorry :)
--
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