[Samba] Dtrace of smbd shows some errors in FreeBSD 9.2 with Samba 4.1.11 possibly related to talloc
Andrew Walker
walker.aj325 at gmail.com
Tue Sep 16 18:56:10 MDT 2014
Opening folders containing 10K files totaling 20GB is slow (takes 1.5 - 2.0
minutes) in FreeBSD 9.2 with Samba 4.1.11 on a system with 32GB RAM and a
newer Xeon processor.
Server is a standalone server that I'm using for testing. I am using nfsv4
acls.
I used the procsystime dtrace script from here:
http://www.brendangregg.com/DTrace/procsystime with the following syntax:
procsystime -n smbd
Top offenders were as follows:
fcntl 64334950
extattr_list_file 88368438
stat 305050713
getdirentries 480578501
poll 60233510027
extattr_get_file 63198610831
I decided to poke around a bit since I am a noob and noticed the following
errors in my dtrace output:
trace -n 'syscall:::return /execname=="smbd"/ {@[ustack)] = count(); }'
libc.so.7`__sys_close+0xc
libsmbd_base.so`smb_vfs_call_closedir+0x50
libsmbd_base.so`0x800b27a92
libtalloc.so.2`0x8036b205e
dtrace: ERROR: open failed: No such file or directory
`0x8115768c0
dtrace: ERROR: open failed: No such file or directory
`0x811576680
dtrace: ERROR: open failed: No such file or directory
`0x81149e200
dtrace: ERROR: open failed: No such file or directory
`0x811499b70
dtrace -n 'syscall:::entry /execname=="smbd"/ {@[ustack()] = count(); }'
libc.so.7`__sys_close+0xc
libsmbd_base.so`smb_vfs_call_closedir+0x50
libsmbd_base.so`0x800b27a92
libtalloc.so.2`0x8036b205e
dtrace: ERROR: gelf_getehdr() failed: No error: 0
passdb.tdb`0x81157a1c0
dtrace: ERROR: gelf_getehdr() failed: No error: 0
passdb.tdb`0x81154d280
dtrace: ERROR: gelf_getehdr() failed: No error: 0
passdb.tdb`0x81149e280
dtrace: ERROR: gelf_getehdr() failed: No error: 0
passdb.tdb`0x8115780c0
dtrace: ERROR: gelf_getehdr() failed: No error: 0
passdb.tdb`0x81149e300
I'm not familiar with dtrace / the innards of samba. Is this normal
behavior? Is this because passdb.tdb is located in a different location
than the rest of samba's tdb files?
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