From c4220c3d8cb912f245f536e5d429868726817bb6 Mon Sep 17 00:00:00 2001
From: Pavel Krymets <pavel@krymets.com>
Date: Fri, 22 Jul 2016 09:21:52 -0700
Subject: [PATCH] Pass bigger buffer size to StreamCopyOperation.CopyToAsync
 (#148)

---
 src/Microsoft.AspNetCore.StaticFiles/StaticFileContext.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Microsoft.AspNetCore.StaticFiles/StaticFileContext.cs b/src/Microsoft.AspNetCore.StaticFiles/StaticFileContext.cs
index 3d182b172a..3e5696744c 100644
--- a/src/Microsoft.AspNetCore.StaticFiles/StaticFileContext.cs
+++ b/src/Microsoft.AspNetCore.StaticFiles/StaticFileContext.cs
@@ -22,6 +22,7 @@ namespace Microsoft.AspNetCore.StaticFiles
 {
     internal struct StaticFileContext
     {
+        private const int StreamCopyBufferSize = 64 * 1024;
         private readonly HttpContext _context;
         private readonly StaticFileOptions _options;
         private readonly PathString _matchUrl;
@@ -356,7 +357,8 @@ namespace Microsoft.AspNetCore.StaticFiles
             Stream readStream = _fileInfo.CreateReadStream();
             try
             {
-                await StreamCopyOperation.CopyToAsync(readStream, _response.Body, _length, _context.RequestAborted);
+                // Larger StreamCopyBufferSize is required because in case of FileStream readStream isn't going to be buffering
+                await StreamCopyOperation.CopyToAsync(readStream, _response.Body, _length, StreamCopyBufferSize, _context.RequestAborted);
             }
             finally
             {