From c93cfa534aea23aaae148dfe414fd82d8f6afda0 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Fri, 18 Mar 2016 16:43:52 +0100
Subject: kernel: Reduce sendfile fallback chunk size

This is necessary for windows to perform correctly when writing
large files.
---
 lib/kernel/src/file.erl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/kernel/src/file.erl')

diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index 1007f04413..1076e02422 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -1227,7 +1227,8 @@ change_time(Name, {{AY, AM, AD}, {AH, AMin, ASec}}=Atime,
 %% Send data using sendfile
 %%
 
--define(MAX_CHUNK_SIZE, (1 bsl 20)*20). %% 20 MB, has to fit in primary memory
+%% 1 MB, Windows seems to behave badly if it is much larger then this
+-define(MAX_CHUNK_SIZE, (1 bsl 20)).
 
 -spec sendfile(RawFile, Socket, Offset, Bytes, Opts) ->
    {'ok', non_neg_integer()} | {'error', inet:posix() | 
-- 
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