NIS slows down login?

["Thomas Gebhardt" <gebhardt@HRZ.Uni-Marburg.DE>]

Hi,

when I activate NIS on my (up to date) hamm system, logins and su
are rapidly slowed down even for local users. It takes several
seconds to su from root to a local user, i.e., a user listed in
/etc/passwd. The NIS maps are rather large (about 5000
users). ypbind is bound to the local NIS slave server.

my nsswitch.conf entries:

passwd:         files nis
group:          files nis
shadow:         files    

hosts:          files dns
networks:       files
   
If I remove NIS from nsswitch.conf, the login process speeds up
tremendously.

I looked at the output of

strace su localuser

(NIS activated) and noticed that a couple of system calls
are repeated several thousand times. Here they are:

open("/var/yp/binding/my_nis_domain.2", O_RDONLY) = 5
readv(5, [{"\223\3", 2}, {"\1\0\0\0\177\0\0\1\3\221\0\0", 12}], 2) = 14
close(5)                                = 0
gettimeofday({890831240, 952496}, NULL) = 0
getpid()                                = 26355
socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 5
bind(5, {sin_family=AF_INET, sin_port=htons(668), sin_addr=inet_addr("0.0.0.0")
}
, 16) = 0
ioctl(5, FIONBIO, [1])                  = 0
fcntl(5, F_SETFD, FD_CLOEXEC)           = 0
sendto(5, "6\27\357\313\0\0\0\0\0\0\0\2\0\1"..., 88, 0, {sin_family=AF_INET, 
sin
_port=htons(913), sin_addr=inet_addr("127.0.0.1")}, 16) = 88
select(256, [5], NULL, NULL, {5, 0})    = 1 (in [5], left {5, 0})
recvfrom(5, "6\27\357\313\0\0\0\1\0\0\0\0\0\0"..., 8800, 0, 
{sin_family=AF_INET,
 sin_port=htons(913), sin_addr=inet_addr("127.0.0.1")}, [16]) = 72
close(5)                                = 0
open("/var/yp/binding/my_nis_domain.2", O_RDONLY) = 5        
... and so on

Any hints?

Thanks, Thomas

-- 
Th. Gebhardt (gebhardt@hrz.uni-marburg.de)
---------------------------------------------------------------
HRZ, Hans Meerwein Strasse,        Phone: +49-6421/28-3572
D-35032 Marburg, Germany           Fax  :            -6994



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