From: Jordan Lee <jordan@transmissionbt.com>
Date: Wed, 4 May 2011 21:38:01 +0000 (+0000)
Subject: (trunk libT) #2338 "Add uTP support" -- increase the block bandwidth to 3000 bytes... 
X-Git-Tag: 2.30~23
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f8f02fe7c3282b8e99fc687cc952920e618cb6bb;p=transmission

(trunk libT) #2338 "Add uTP support" -- increase the block bandwidth to 3000 bytes in phase 1 as suggested by jch in comment:120.

The rationale is that by using 3000 bytes we'll send one full-size frame straight away, and leave enough buffered data for the next frame to go out in a timely manner.
---

diff --git a/libtransmission/bandwidth.c b/libtransmission/bandwidth.c
index 96c00053e..c728fcf73 100644
--- a/libtransmission/bandwidth.c
+++ b/libtransmission/bandwidth.c
@@ -225,7 +225,11 @@ phaseOne( tr_ptrArray * peerArray, tr_direction dir )
     i = n ? tr_cryptoWeakRandInt( n ) : 0; /* pick a random starting point */
     while( n > 0 )
     {
-        const size_t increment = 1024;
+        /* value of 3000 bytes chosen so that when using uTP we'll send a full-size
+         * frame right away and leave enough buffered data for the next frame to go
+         * out in a timely manner. */
+        const size_t increment = 3000;
+
         const int bytesUsed = tr_peerIoFlush( peers[i], dir, increment );
 
         dbgmsg( "peer #%d of %d used %d bytes in this pass", i, n, bytesUsed );