Re: libfetch ftp patch for less latency

Nate Lawson <nate@xxxxxxxx> writes:
To speed up pkg_add and other ftp command channel performance over slow
links, change this:

PWD
<<< 257 "/"
CWD pub
<<< 250 Directory successfully changed.
CWD FreeBSD
<<< 250 Directory successfully changed.
CWD ports
<<< 250 Directory successfully changed.
CWD amd64
<<< 250 Directory successfully changed.
CWD packages-6-stable
<<< 250 Directory successfully changed.
CWD Latest
<<< 250 Directory successfully changed.
MODE S

Into this:

PWD
<<< 257 "/"
CWD pub/FreeBSD/ports/amd64/packages-6-stable/Latest
<<< 250 Directory successfully changed.

No. This is a violation of the FTP protocol.

All ftp servers I've ever seen support a full path when changing down
dirs. This might be a DOS ftp server thing however. In any case, if
there is an error to the all-in-one CWD, the code reverts back to legacy
behavior of multiple CWDs.

When the all-in-one CWD fails, you're SOL. You have no idea what
state the server is in, and you have to start over.

DES
--
Dag-Erling Smørgrav - des@xxxxxx
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