Re: High load in 2.6.27, NFS / rpcauth_lookup_credcache()?
On Wed, Oct 22, 2008 at 11:12:08AM +0200, Max Kellermann wrote:[color=blue]
> after I was able to fix [url]http://lkml.org/lkml/2008/10/17/147[/url], the
> server which was already upgraded to 22.214.171.124 still gets very high
> load. It is a web server with NFS file storage (NetApp), and while
> the others in the cluster (kernel 2.6.25) have a load of 1-3, 126.96.36.199
> gets 30-50.
> I did an oprofile, with the following results (server just started,
> load "only" 5-10):[/color]
Well, there's only 7 patches to net/sunrpc/auth.c between 2.6.25 and
today, so worst case a 'git bisect v2.6.25..v2.6.27 net/sunrpc/auth.c'
might not be too bad.
No particular idea why rpcauth_lookup_credcache would be a problem,
> 87593 56.1116 (no location information) vmlinux
> vmlinux rpcauth_lookup_credcache
> 16037 10.2732 auth_generic.c:0 vmlinux
> vmlinux generic_match
> 6460 4.1382 (no location information) php4
> php4 (no symbols)
> 2478 1.5874 (no location information) libc-2.7.so
> libc-2.7.so (no symbols)
> We havn't configured any special authentication method. It is a NFSv3
> over UDP mount, but the kernel has NFSv4 and therefore KRB5 enabled.
> Any ideas why rpcauth_lookup_credcache() goes overboard with CPU
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