Changeset 8770 for trunk/libtransmission/torrent.c

Timestamp:

Jul 2, 2009, 1:50:07 AM (13 years ago)

Author:

charles

Message:

(trunk libT) #529: Time remaining for downloads is unreliable

File:

• trunk/libtransmission/torrent.c (modified) (1 diff)

trunk/libtransmission/torrent.c

@@ -948 +948 @@
             else if( s->pieceDownloadSpeed < 0.1 )
                 s->eta = TR_ETA_UNKNOWN;
-            else
-                s->eta = s->leftUntilDone / s->pieceDownloadSpeed / 1024.0;
+            else {
+                /* etaSpeed exists because if we pieceDownloadSpeed directly,
+                 * brief fluctuations cause the ETA to jump all over the place.
+                 * so, etaSpeed is a smoothed-out version of pieceDownloadSpeed
+                 * to dampen the effect of fluctuations */
+                if( ( tor->etaSpeedCalculatedAt + 800 ) < now ) {
+                    tor->etaSpeedCalculatedAt = now;
+                    tor->etaSpeed = fabs(tor->etaSpeed>0.001)
+                        ? s->pieceDownloadSpeed /* if no previous speed, no need to smooth */
+                        : 0.8*tor->etaSpeed + 0.2*s->pieceDownloadSpeed; /* smooth across 5 readings */
+                }
+                s->eta = s->leftUntilDone / tor->etaSpeed / 1024.0;
+            }
             break;