56 lines
2.2 KiB
Diff
56 lines
2.2 KiB
Diff
|
From 17c5524ada3f2ca9a9c645f540bedc5575302059 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Eric Blake <eblake@redhat.com>
|
||
|
|
Date: Mon, 3 Apr 2023 19:40:47 -0500
|
||
|
|
Subject: [PATCH 5/5] nbd/server: Request TCP_NODELAY
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
RH-Author: Eric Blake <eblake@redhat.com>
|
||
|
|
RH-MergeRequest: 274: nbd: improve TLS performance of NBD server
|
||
|
|
RH-Bugzilla: 2035712
|
||
|
|
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||
|
|
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
|
||
|
|
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
|
||
|
|
RH-Commit: [2/2] 092145077756cda2a4f849c5911031b0fc4a2134 (ebblake/qemu-kvm)
|
||
|
|
|
||
|
|
Nagle's algorithm adds latency in order to reduce network packet
|
||
|
|
overhead on small packets. But when we are already using corking to
|
||
|
|
merge smaller packets into transactional requests, the extra delay
|
||
|
|
from TCP defaults just gets in the way (see recent commit bd2cd4a4).
|
||
|
|
|
||
|
|
For reference, qemu as an NBD client already requests TCP_NODELAY (see
|
||
|
|
nbd_connect() in nbd/client-connection.c); as does libnbd as a client
|
||
|
|
[1], and nbdkit as a server [2]. Furthermore, the NBD spec recommends
|
||
|
|
the use of TCP_NODELAY [3].
|
||
|
|
|
||
|
|
[1] https://gitlab.com/nbdkit/libnbd/-/blob/a48a1142/generator/states-connect.c#L39
|
||
|
|
[2] https://gitlab.com/nbdkit/nbdkit/-/blob/45b72f5b/server/sockets.c#L430
|
||
|
|
[3] https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md#protocol-phases
|
||
|
|
|
||
|
|
CC: Florian Westphal <fw@strlen.de>
|
||
|
|
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||
|
|
Message-Id: <20230404004047.142086-1-eblake@redhat.com>
|
||
|
|
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
|
||
|
|
(cherry picked from commit f1426881a827a6d3f31b65616c4a8db1e9e7c45e)
|
||
|
|
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||
|
|
---
|
||
|
|
nbd/server.c | 1 +
|
||
|
|
1 file changed, 1 insertion(+)
|
||
|
|
|
||
|
|
diff --git a/nbd/server.c b/nbd/server.c
|
||
|
|
index a5edc7f681..6db124cf53 100644
|
||
|
|
--- a/nbd/server.c
|
||
|
|
+++ b/nbd/server.c
|
||
|
|
@@ -2738,6 +2738,7 @@ void nbd_client_new(QIOChannelSocket *sioc,
|
||
|
|
}
|
||
|
|
client->tlsauthz = g_strdup(tlsauthz);
|
||
|
|
client->sioc = sioc;
|
||
|
|
+ qio_channel_set_delay(QIO_CHANNEL(sioc), false);
|
||
|
|
object_ref(OBJECT(client->sioc));
|
||
|
|
client->ioc = QIO_CHANNEL(sioc);
|
||
|
|
object_ref(OBJECT(client->ioc));
|
||
|
|
--
|
||
|
|
2.39.1
|
||
|
|
|