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Re: ACPI/HT or Packet Scheduler BUG?

from [Herbert Xu] [Permanent Link][Original]
To: Thomas Graf <tgraf@xxxxxxx>
Subject: Re: ACPI/HT or Packet Scheduler BUG?
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 16 Apr 2005 21:23:29 +1000
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, hadi@xxxxxxxxxx, netdev <netdev@xxxxxxxxxxx>, Tarhon-Onu Victor <mituc@xxxxxxxxxxxxxx>, kuznet@xxxxxxxxxxxxx, devik@xxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Patrick McHardy <kaber@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>
In-reply-to: <20050416110639.GI4114@postel.suug.ch>
References: <Pine.LNX.4.61.0504081225510.27991@blackblue.iasi.rdsnet.ro> <Pine.LNX.4.61.0504121526550.4822@blackblue.iasi.rdsnet.ro> <Pine.LNX.4.61.0504141840420.13546@blackblue.iasi.rdsnet.ro> <1113601029.4294.80.camel@localhost.localdomain> <1113601446.17859.36.camel@localhost.localdomain> <1113602052.4294.89.camel@localhost.localdomain> <20050415225422.GF4114@postel.suug.ch> <20050416014906.GA3291@gondor.apana.org.au> <20050416110639.GI4114@postel.suug.ch>
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On Sat, Apr 16, 2005 at 01:06:39PM +0200, Thomas Graf wrote:
> 
> It's not completely useless, it speeds up the deletion classful
> qdiscs having some depth. However, it's not worth the locking
> troubles I guess.

RCU is meant to optimise the common reader path.  In this case
that's the packet transmission code.  Unfortunately it fails
miserably when judged by that criterion.
-- 
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