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/
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