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Ubuntu 下 mount windows 共享目录

一般来说遇到标题所述问题我马上会想到smbfs，不过好久不用，最近发现smbfs已经没有了，取而代之的是cifs，于是命令大约是

sudo mount -t cifs //hostname//folder /localfolder -o user=username

不过总是报 Input/ouput error

google了一阵，有的说加上sec=ntlm有的说加iocharset=utf8，不过都没用。其中加了后者还会出 Can not access a needed shared library 的错误。根据 http://wiki.openwrt.org/doc/howto/cifs.client   和 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1067681， 安装了linux-image-extra-***的包以后才可以，但是mount还是不行。（我的linux是在虚拟器，装的最小内核linux-virtual）

于是尝试了一下smbclient，也是报错：tree connect failed: NT_STATUS_INSUFF_SERVER_RESOURCES 根据 http://klebom.net/melazy/tricks/ 查到是IRPStackSize过小的问题， 我在windows也确实查到了事件： 
Log Name:      System
Source:        srv
Date:          2013-10-20 14:08:29
Event ID:      2011
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ***
Description:
The server's configuration parameter "irpstacksize" is too small for the server to use a local device.  Please increase the value of this parameter.

于是查到需要改注册表
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\IRPStackSize

这是个DWORD值，根据http://support.microsoft.com/kb/285089说其默认值是15，可取范围是11-50。之前那个链接说改成了17，18才可以，但我一直尝试到20都不行，于是一口气改成32才可以。

但愿没有后遗症。具体原因仍不明，不知道是否跟在跑linux虚拟机有关。
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