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把NTP从平均数改成中位数，防止极端值干扰

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This commit is contained in:
KNEMC
2026-09-01 15:36:15 +08:00
parent 21b975676d
commit 6d6a199728
5 changed files with 48 additions and 56 deletions
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src/org/kne/cloud/network/ntp/NTPContext.java
+7 -28
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@@ -26,7 +26,7 @@ import org.kne.math.Long128;
public class NTPContext implements Closeable, AutoCloseable {
private HighAccuracyClock clock;
private static final boolean debug = false;
private static final int REQUEST_COUNT = 10;
private static final int REQUEST_COUNT = 5;
private Long128 systemFrequencyOffset = NTPTimestamps.nanosToNtp128BitTimeInterval(new Long128(5000));
private Long128 localPrecision = NTPTimestamps.nanosToNtp128BitTimeInterval(new Long128(1000));
@@ -117,7 +117,7 @@ public class NTPContext implements Closeable, AutoCloseable {
}
protected void putPacket(NTPv4Packet nv4, MultiProtocolSocketAddress inetSocketAddress) {
checkIP();
//checkIP();
List<NTPv4Packet> newv = new Vector<NTPv4Packet>();
List<NTPv4Packet> oldv = recvmap.putIfAbsent(inetSocketAddress, newv);
if (oldv == null) {
@@ -132,25 +132,6 @@ public class NTPContext implements Closeable, AutoCloseable {
}
}
private void checkIP() {
Set<Entry<MultiProtocolSocketAddress, List<NTPv4Packet>>> ens = recvmap.entrySet();
for (Iterator<Entry<MultiProtocolSocketAddress, List<NTPv4Packet>>> iterator = ens.iterator(); iterator
.hasNext();) {
Entry<MultiProtocolSocketAddress, List<NTPv4Packet>> entry = (Entry<MultiProtocolSocketAddress, List<NTPv4Packet>>) iterator
.next();
AtomicBoolean ab = new AtomicBoolean(false);
ios.forEach((x) -> {
if (!ab.get())
if (x.findPeer(entry.getKey()) != null) {
ab.set(true);
return;
}
});
if (!ab.get()) {
iterator.remove();
}
}
}
private class PeerInfo implements Comparable<PeerInfo> {
private MultiProtocolSocketAddress address;
@@ -225,14 +206,12 @@ public class NTPContext implements Closeable, AutoCloseable {
PeerInfo pix = peerInfo.get(0);
currentClock = pix;
int i;
int m = Math.min(peerInfo.size(), 3);
Long128 bi = Long128.ZERO;
for (i = 0; i < m; i++) {
PeerInfo pi = peerInfo.get(i);
Long128 adjt = pi.getAdj();
bi = bi.add(adjt);
List<Long128> adjts = new ArrayList<>();
for (i = 0; i < peerInfo.size(); i++) {
adjts.add(peerInfo.get(i).getAdj());
}
Long128 delta = bi.divide(Long128.valueOf(i));
Long128 delta = NTPTimestamps. median(adjts);
//System.out.println(adjts+":"+delta);
avgAdj=(avgAdj*7+delta.abs().longValue())/8;
Long128 deltaabs=delta.abs();
if (deltaabs.compareTo(adjustThreshold0) > 0&&firstSync.compareAndSet(true, false)) {