From: Stephen Hemminger <shemminger@osdl.org>
To: Guillaume Chazarain <guichaz@yahoo.fr>
Cc: netdev@vger.kernel.org
Subject: Re: Netem does not work with loopback
Date: Fri, 14 Jul 2006 08:38:47 -0700 [thread overview]
Message-ID: <20060714083847.6997a460@localhost.localdomain> (raw)
In-Reply-To: <44B7AB76.2030700@yahoo.fr>
On Fri, 14 Jul 2006 16:34:30 +0200
Guillaume Chazarain <guichaz@yahoo.fr> wrote:
> Hello,
>
> Is it a known problem that the Netem qdisc is very unreliable on the
> loopback (unlike on a true NIC)?
>
> This seems to come from its usage of skb->cb which conflicts with IPCB.
> For instance, the field
> IPCB(skb)->opt.optlen becomes non-null and memory corruption follows.
>
> I ``worked around'' this conflict with the following ugly hack:
Isn't the skb owned by netem at that point...
--
If one would give me six lines written by the hand of the most honest
man, I would find something in them to have him hanged. -- Cardinal Richlieu
next prev parent reply other threads:[~2006-07-14 15:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-14 14:34 Netem does not work with loopback Guillaume Chazarain
2006-07-14 15:38 ` Stephen Hemminger [this message]
2006-07-14 17:04 ` Guillaume Chazarain
2006-07-14 18:39 ` Stephen Hemminger
2006-07-14 18:49 ` Guillaume Chazarain
2006-07-14 18:56 ` [PATCH] clear skb cb on IP input Stephen Hemminger
2006-07-14 21:48 ` David Miller
2006-07-15 13:28 ` Herbert Xu
2006-07-15 15:50 ` Stephen Hemminger
2006-07-16 1:15 ` David Miller
2006-07-16 1:12 ` David Miller
2006-07-16 11:20 ` chas williams - CONTRACTOR
2006-07-17 2:02 ` David Miller
2006-07-18 18:19 ` Guillaume Chazarain
2006-07-18 19:43 ` Herbert Xu
2006-07-19 12:35 ` Guillaume Chazarain
2006-07-25 6:45 ` David Miller
2006-07-16 22:03 ` Herbert Xu
2006-07-17 1:18 ` David Miller
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