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ssh: Speed up RPCs by using #:nodelay.

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Partly fixes <https://bugs.gnu.org/41702>.

* guix/ssh.scm (open-ssh-session): Enable #:nodelay.
* m4/guix.m4 (GUIX_CHECK_GUILE_SSH): Add feature check for this new parameter.
* doc/guix.texi (Requirements): Adjust.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Lars-Dominik Braun 2020-07-20 11:28:51 +02:00 committed by Ludovic Courtès
parent 6c451e16b7
commit e8088f0b06
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3 changed files with 11 additions and 5 deletions
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4
doc/guix.texi
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@ -791,11 +791,11 @@ The following dependencies are optional:
@itemize
@item
@c Note: We need at least 0.12.0 for 'userauth-gssapi!'.
@c Note: We need at least 0.13.0 for #:nodelay.
Support for build offloading (@pxref{Daemon Offload Setup}) and
@command{guix copy} (@pxref{Invoking guix copy}) depends on
@uref{https://github.com/artyom-poptsov/guile-ssh, Guile-SSH},
version 0.12.0 or later.
version 0.13.0 or later.
@item
When @url{https://www.nongnu.org/lzip/lzlib.html, lzlib} is available, lzlib

6
guix/ssh.scm
View file

@ -129,7 +129,11 @@ (define* (open-ssh-session host #:key user port identity
;; We need lightweight compression when
;; exchanging full archives.
#:compression compression
#:compression-level 3)))
#:compression-level 3
;; Speed up RPCs by creating sockets with
;; TCP_NODELAY.
#:nodelay #t)))
;; Honor ~/.ssh/config.
(session-parse-config! session)

6
m4/guix.m4
View file

@ -142,14 +142,16 @@ dnl GUIX_CHECK_GUILE_SSH
dnl
dnl Check whether a recent-enough Guile-SSH is available.
AC_DEFUN([GUIX_CHECK_GUILE_SSH], [
dnl Check whether 'userauth-gssapi!' (introduced in 0.12.0) is present.
dnl Check whether '#:nodelay' paramater to 'make-session' (introduced in
dnl 0.13.0) is present.
AC_CACHE_CHECK([whether Guile-SSH is available and recent enough],
[guix_cv_have_recent_guile_ssh],
[GUILE_CHECK([retval],
[(and (@ (ssh channel) channel-send-eof)
(@ (ssh popen) open-remote-pipe)
(@ (ssh dist node) node-eval)
(@ (ssh auth) userauth-gssapi!))])
(@ (ssh auth) userauth-gssapi!)
((@ (ssh session) make-session) #:nodelay #t))])
if test "$retval" = 0; then
guix_cv_have_recent_guile_ssh="yes"
else