netdev - Re: [PATCH 20/31]: pkt_sched: Perform bulk of qdisc destruction in RCU.

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Date:	Thu, 17 Jul 2008 09:35:32 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	johannes@...solutions.net, linux-wireless@...r.kernel.org
Subject: Re: [PATCH 20/31]: pkt_sched: Perform bulk of qdisc destruction in
	RCU.

On Thu, 2008-17-07 at 15:03 +0200, Patrick McHardy wrote:

> Actions are also visible
> globally, so this might still be a problem, not sure though since
> they don't refer to their parent (haven't thought about it much yet).

Actions are fine because they are intended to be globaly shared.
[i.e A classifier on ethx with qdiscA:Y (in/egress) can share an action
with  classifer on  ethy with qdiscB:Z (eg/ingress)].
Like you i need to digest the patches to understand the impact on the
rest but one thing i did notice was the last patch (replacement of
pfifo_fast):
prioritization based on TOS/DSCP (setsockopt) would no longer work, some
user space code may suffer (routing daemons likely). One suggestion to
fix it is to load pfifo qdisc (which does what fifo_fast is attempting)
for drivers that are h/ware multiq capable.

cheers,
jamal

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