CIFS/SMBFS failing under load in 2.6.X

[Christoph Lameter]

Whenever I put a high load on CIFS or SMBFS requests timeout and then the
benchmark or whatever I run fails. I ran the same tests successfully with
a 2.4.25 kernel. This is a connection to a samba 3.0.2 server.

SMBFS logs the following:

Apr 12 15:59:25 testbox kernel: smb_add_request: request [ca7b7280,
mid=12891] timed out!
Apr 12 15:59:25 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 15:59:26 testbox kernel: smb_add_request: request [ca7b7080,
mid=13701] timed out!
Apr 12 15:59:26 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 16:00:08 testbox kernel: smb_add_request: request [ca7b7c80,
mid=47333] timed out!
Apr 12 16:00:08 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5
Apr 12 16:00:10 testbox kernel: smb_add_request: request [ca7b7880,
mid=48900] timed out!
Apr 12 16:00:10 testbox kernel: smb_writepage_sync: failed write, wsize=1,
result=-5
Apr 12 16:00:13 testbox kernel: smb_add_request: request [ca7b7180,
mid=50657] timed out!
Apr 12 16:00:13 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5
Apr 12 16:00:22 testbox kernel: smb_add_request: request [ca7b7e80,
mid=57576] timed out!
Apr 12 16:00:22 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 16:00:22 testbox kernel: smb_add_request: request [ca7b7d80,
mid=57900] timed out!
Apr 12 16:00:22 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 16:00:39 testbox kernel: smb_add_request: request [ca7b7b80,
mid=9411] timed out!
Apr 12 16:00:39 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 16:01:22 testbox kernel: smb_add_request: request [ca7b7980,
mid=40403] timed out!
Apr 12 16:01:22 testbox kernel: smb_writepage_sync: failed write, wsize=1,
result=-5
Apr 12 16:04:53 testbox kernel: smb_add_request: request [c9d25980,
mid=35372] timed out!
Apr 12 16:04:53 testbox kernel: smb_writepage_sync: failed write,
wsize=4096, result=-5
Apr 12 16:04:53 testbox kernel: smb_add_request: request [c9d25580,
mid=35548] timed out!
Apr 12 16:04:53 testbox kernel: smb_writepage_sync: failed write,
wsize=53, result=-5
Apr 12 16:05:32 testbox kernel: smb_add_request: request [c9d25b80,
mid=5926] timed out!
Apr 12 16:05:32 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5
Apr 12 16:05:32 testbox kernel: smb_add_request: request [c9d25780,
mid=5993] timed out!
Apr 12 16:05:32 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5
Apr 12 16:05:35 testbox kernel: smb_add_request: request [c9d25680,
mid=7816] timed out!
Apr 12 16:05:35 testbox kernel: smb_writepage_sync: failed write, wsize=1,
result=-5
Apr 12 16:05:38 testbox kernel: smb_add_request: request [c9d25c80,
mid=10166] timed out!
Apr 12 16:05:38 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5
Apr 12 16:05:38 testbox kernel: smb_add_request: request [c9d25d80,
mid=10231] timed out!
Apr 12 16:05:38 testbox kernel: smb_writepage_sync: failed write,
wsize=2048, result=-5


CIFS logs:

Apr 12 17:02:00 testbox kernel:  CIFS VFS: Send error in write = -6
Apr 12 17:02:29 testbox kernel:  CIFS VFS: Send error in write = -5
Apr 12 17:02:29 testbox last message repeated 8 times
Apr 12 17:02:39 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:02:49 testbox last message repeated 10 times
Apr 12 17:02:49 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:02:59 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:02:59 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:09 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:09 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:14 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:19 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:19 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:20 testbox kernel:  CIFS VFS: Error 0xfffffffb or (-5
decimal) on cifs_get_inode_info in lookup
Apr 12 17:03:35 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:45 testbox kernel:  CIFS VFS: Need to reconnect after session
died to server
Apr 12 17:03:46 testbox kernel:  CIFS VFS: cifs_umount failed with return
code -5

Tests were run with Linux 2.6.5.

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