netdev - Re: [PATCH RFC 0/2] tun: lockless xmit

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: <1460555021.10638.20.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Wed, 13 Apr 2016 06:43:41 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kurz <gkurz@...ux.vnet.ibm.com>,
	Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH RFC 0/2] tun: lockless xmit

On Wed, 2016-04-13 at 16:17 +0300, Michael S. Tsirkin wrote:
> On Wed, Apr 13, 2016 at 06:09:26AM -0700, Eric Dumazet wrote:
> > You really need to convince John Fastabend to work full time on the real
> > thing
> 
> Meaning making all qdiscs themselves lockless? With complex policies
> like codel I can see how that might be challenging ...

Codel is a fifo, plus some droping capabilities at dequeue time.

It totally can be made lockless.