From 56ea0a14afeff83025190fcb36182d84847cb047 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Tue, 15 Dec 2020 11:24:11 -0800
Subject: [PATCH] modules/federation/sender: Use preallocated response content
 buffer.

---
 modules/federation/sender.cc | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/modules/federation/sender.cc b/modules/federation/sender.cc
index 7b5ad8324..cf504cb6d 100644
--- a/modules/federation/sender.cc
+++ b/modules/federation/sender.cc
@@ -39,24 +39,29 @@ struct txndata
 	{}
 };
 
-struct txn
+struct alignas(32_KiB) txn
 :txndata
 ,m::fed::send
 {
 	struct node *node;
 	steady_point timeout;
-	char headers[8_KiB];
+	char buf[31_KiB];
 
 	txn(struct node &node,
 	    std::string content,
 	    m::fed::send::opts opts)
 	:txndata{std::move(content)}
-	,send{this->txnid, string_view{this->content}, this->headers, std::move(opts)}
+	,send{this->txnid, string_view{this->content}, this->buf, std::move(opts)}
 	,node{&node}
 	,timeout{now<steady_point>()} //TODO: conf
 	{}
 };
 
+static_assert
+(
+	sizeof(struct txn) == 32_KiB
+);
+
 struct node
 {
 	std::deque<std::shared_ptr<unit>> q;
@@ -448,6 +453,7 @@ try
 
 	m::fed::send::opts opts;
 	opts.remote = remote;
+	opts.dynamic = false;
 	opts.sopts = &sopts;
 
 	const vector_view<const json::value> pduv