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-rw-r--r--guix/build/download.scm2
-rw-r--r--guix/http-client.scm12
2 files changed, 12 insertions, 2 deletions
diff --git a/guix/build/download.scm b/guix/build/download.scm
index 5d881b93ee..d98933a907 100644
--- a/guix/build/download.scm
+++ b/guix/build/download.scm
@@ -167,8 +167,6 @@ which is not available during bootstrap."
;; Buffer input and output on this port.
(setvbuf s _IOFBF)
- ;; Enlarge the receive buffer.
- (setsockopt s SOL_SOCKET SO_RCVBUF (* 12 1024))
(if (eq? 'https (uri-scheme uri))
(tls-wrap s)
diff --git a/guix/http-client.scm b/guix/http-client.scm
index 1f05df4b05..4770628e45 100644
--- a/guix/http-client.scm
+++ b/guix/http-client.scm
@@ -162,7 +162,19 @@ closed it will also close PORT, unless the KEEP-ALIVE? is true."
(define* (open-socket-for-uri uri #:key (buffered? #t))
"Return an open port for URI. When BUFFERED? is false, the returned port is
unbuffered."
+ (define rmem-max
+ ;; The maximum size for a receive buffer on Linux, see socket(7).
+ "/proc/sys/net/core/rmem_max")
+
+ (define buffer-size
+ (if (file-exists? rmem-max)
+ (call-with-input-file rmem-max read)
+ 126976)) ; the default for Linux, per 'rmem_default'
+
(let ((s ((@ (web client) open-socket-for-uri) uri)))
+ ;; Work around <http://bugs.gnu.org/15368> by restoring a decent
+ ;; buffer size.
+ (setsockopt s SOL_SOCKET SO_RCVBUF buffer-size)
(unless buffered?
(setvbuf s _IONBF))
s))