genode/repos/dde_linux/patches/lxip_tcp.patch

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From 8b2f74f2258b62ca0e62656cdccbc9159aeab893 Mon Sep 17 00:00:00 2001
From: Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
Date: Tue, 6 Aug 2013 16:12:54 +0200
Subject: [PATCH] L4Linux: Increase TCP-window size
TCP window size is calculated by the amount of memory within L4Linux, use a
larger window size to allow acceptable performance even on smaller VMs.
---
net/ipv4/tcp.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e220207..29613bf 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3648,6 +3648,13 @@ void __init tcp_init(void)
tcp_init_mem(&init_net);
/* Set per-socket limits to no more than 1/128 the pressure threshold */
limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7);
+
+ /*
+ * Adjust limit so it performs well on systems with little memory. If
+ * this causes errors increase L4Linux main memory
+ */
+ limit = limit < 1024U * 1024 ? 1024U * 1024 : limit;
+
max_wshare = min(4UL*1024*1024, limit);
max_rshare = min(6UL*1024*1024, limit);
--
1.8.4