Fwd: Audit / Netlink slowness

[Timothy R. Chavez]

Just passing this down the grapevine...

-tim

On Tuesday 14 June 2005 02:50, Jerone Young wrote:
> ---------- Forwarded message ----------
> From: Bernardo Innocenti <bernie at develer.com>
> Date: Jun 14, 2005 2:04 AM
> Subject: Audit / Netlink slowness
> To: fedora-devel-list at redhat.com
> 
> 
> Hello,
> 
> on a server running kernel 2.6.11-1.1369_FC4, both ssh
> and su where taking a longish amount of time (over >1.5 sec.)
> 
> Running "strace -r 2>strace.out su", I discovered that
> netlink communication is the major cause of slowdown.
> 
> "su" connects to a NETLINK_AUDIT socket 3 or 4 times.
> Each time it does 2 sendto() + recvfrom() operations,
> with a latency of ~200ms.  This adds up to 800ms wasted
> time.
> 
> Disabling CONFIG_AUDIT in the kernel makes su and ssh
> very fast again.
> 
> Is this behavior to be expected?  CONFIG_AUDIT is enabled
> by default, therefore many people are going to be hit by
> this problem.
> 
> --
>   // Bernardo Innocenti - Develer S.r.l., R&D dept.
> \X/  http://www.develer.com/
> 
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>