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Date: Wed, 10 Aug 2005 12:29:19 +0400 (MSD)
From: Maxim Konovalov <maxim@macomnet.ru>
To: Mikhail Teterin <mi@corbulon.video-collage.com>
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Cc: questions@freebsd.org, net@freebsd.org
Subject: Re: very busy ftpd
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On Wed, 10 Aug 2005, 00:40-0400, Mikhail Teterin wrote:

> > > I just noticed, that uploading a file over a LANG (at around
> > > 5.7Mb/s) resulted in around 25% CPU consumption by the ftpd.
> > >
> > > I think, that's unusual for a Pentium4 -- what is the process doing?
> >
> > Check the client does not use ascii mode when uploading (getc() vs
> > read()).
>
> That's quite possible, indeed. I wouldn't put it past some users --
> some still use the ancient ftp-clients, which default to text-mode
> transfers.
>
> Is there any way to disable this mode on the server, perhaps? Even
> if it violates the protocol :-/

A dirty hack:

Index: ftpcmd.y
===================================================================
RCS file: /home/ncvs/src/libexec/ftpd/ftpcmd.y,v
retrieving revision 1.64
diff -u -r1.64 ftpcmd.y
--- ftpcmd.y	18 Nov 2004 13:46:29 -0000	1.64
+++ ftpcmd.y	10 Aug 2005 08:23:09 -0000
@@ -379,6 +379,9 @@
 				switch (cmd_type) {

 				case TYPE_A:
+					reply(504, "Type A not implemented.");
+					break;
+#if 0
 					if (cmd_form == FORM_N) {
 						reply(200, "Type set to A.");
 						type = cmd_type;
@@ -386,7 +389,7 @@
 					} else
 						reply(504, "Form must be N.");
 					break;
-
+#endif
 				case TYPE_E:
 					reply(504, "Type E not implemented.");
 					break;
%%%

-- 
Maxim Konovalov