From e8088f0b06c2193f2cce04a48aa1350229442a9f Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <ldb@leibniz-psychology.org>
Date: Mon, 20 Jul 2020 11:28:51 +0200
Subject: 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>
---
 guix/ssh.scm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'guix/ssh.scm')

diff --git a/guix/ssh.scm b/guix/ssh.scm
index 2d7ca7d01d..b9e6ff8564 100644
--- a/guix/ssh.scm
+++ b/guix/ssh.scm
@@ -129,7 +129,11 @@ Throw an error on failure."
                                ;; 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)
-- 
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