From: Bernardo Innocenti <bernie@develer.com>
To: linux-kernel@vger.kernel.org
Subject: Audit / Netlink slowness
Date: Tue, 14 Jun 2005 08:55:24 +0200 [thread overview]
Message-ID: <42AE7F5C.3000209@develer.com> (raw)
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 in FC4, so many people are going to be hit by
this problem.
Please Cc me in replies as I'm not subrscribed to the lkml.
--
// Bernardo Innocenti - Develer S.r.l., R&D dept.
\X/ http://www.develer.com/
reply other threads:[~2005-06-14 6:55 UTC|newest]
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