Error and slow on copy with 2.6.32 and CIFS VFS Errors

[sunghost]

Hello,
i have install latest 2.1 with Kernel 2.6.32-14 pve. Since that i notice at copying large files following message in syslog

CIFS VFS: Server 192.168.0.29 has not responded in 300 seconds. Reconnecting..

The system hang and all breaks down. How can i solve this?

 

[sunghost]

pveversion
pve-manager/2.1/f32f3f46

and

pveperf
CPU BOGOMIPS: 20216.72
REGEX/SECOND: 1126051
HD SIZE: 286.11 GB (/dev/mapper/server-root)
BUFFERED READS: 115.84 MB/sec
AVERAGE SEEK TIME: 15.99 ms
FSYNCS/SECOND: 786.84
DNS EXT: 214.94 ms
DNS INT: 0.81 ms

tap103 wich is the bridge runs only with 10mbs, how can i change this?