Zero-copy patch

Jacky Lam jlam at
Tue Feb 1 23:23:06 MST 2011

Thanks for the patch. It is Lunar new year for China now. I will back to work next week and let you know the result.


-----Original Message-----
From: Jeremy Allison [mailto:jra at]
Sent: Wednesday, February 02, 2011 1:58 AM
To: Jacky Lam
Cc: Volker.Lendecke at SerNet.DE; samba-technical at
Subject: Re: Zero-copy patch

On Tue, Feb 01, 2011 at 09:03:06AM -0500, Jacky Lam wrote:
> I am curious about that as well. But I have double check most of the time spending while writing to samba server is that two splice call. And the kernel profile is showing that __copy_user() is using 25% CPU time during that period of time.
> I don't know if it is platform dependent problem.....have you try to turn on splice and do a kernel profiling?

Please do and let us know why it isn't working right.
I can help bug the kernel devs to look at it.

FYI for everyone else, I've sent Jacky the kernel
patch to test off-list.


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