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...from samba is also about 4-5 MB/s. I use Oprofile to profile writing file to samba and found that CPU takes over 30% CPU time on copy_from/to_user, so I think going to user space and back again is the bottleneck. Since there is sendfile, why is'nt there counterpart on write path? Is there some difficalties or what? Is it implementable? Please give me some advice. Best Regards, Mac Lin _________________________________________________________________ Áo©ú·j´M©MÂsÄýºô¸ôªº§K¶O¤u¨ã¦C ¡X MSN ·j´M¤u¨ã¦C http://toolbar.live.com/