tux as ftp server question

hi, guys,

Tux reference says tux as FTP server is implemented
totally in kernel(a C module of 900 lines). So I am
wondering what's the use of zero-copy in it. It seems
there is no copy between user-space and kernel-space
at all, right?

Even if we consider ftp server reads data from a file
on the disk(when ftp client announce "get" command),
the data will be put in kernel buffer directly after
being read, right? So what's the use of zero-copy in
Tux ftp server?

Thanks.

sincerely,
li

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