On Wed, Jun 18, 2008 at 9:36 AM, Jan Schulze <[log in to unmask]> wrote: > Hi all, > > I recently upgraded a number of NFS clients from SL 4.2 to SL 5.1. The > NFS server is still running SL 4.2. Clients are acting very slow, e.g. > > - after SSH authentication, it takes about 5 sec. for the console prompt > to appear > - every 'ls' is slow > - compiling stuff is terribly slow > > It seems to have something to do with NFS - I'm having some NFS-mounted > directories in my $PATH (TC shell). When I throw them out, everything is > working as expected (e.g. compiling gcc was ~9 times faster). Please > note, that the same $PATH does not noticeably slow things down on the > old 4.2 systems. > > I did comparisons compiling gcc on the old and new systems while running > tcpdump. I found, that the new systems performed a lot more NFS lookups > (by factor ~4). Everything else seemed normal. > > File transfer to the NFS server is OK, no speed problems here. Tcpdump, > however shows a lot of lines like this one, when copying files: > 18:19:56.571906 IP bsnode02.0 > morphin.nfs: 1448 null > > Load on the NFS server is much higher than before. I'm a little bit at a > loss - how could I debug these issues further? > > > Regards, > Jan This is a known bug. Please see: http://bugs.centos.org/view.php?id=2635 It was fixed in 5.2. Akemi