diff --git a/GitMirror/app.py b/GitMirror/app.py
index bff1d298..29141a62 100644
--- a/GitMirror/app.py
+++ b/GitMirror/app.py
@@ -59,7 +59,14 @@ Manager = MirrorManager(Cfg, Gitea, Github, Store)
 
 
 class SyncWorker:
-    """去重的同步队列 + 工作线程（每仓串行，失败退避重试）"""
+    """去重的同步队列 + 工作线程
+
+    失败处理：丢弃本地镜像并把该仓库**追加到队尾**（不阻塞其它仓库）。
+    每个仓库在单轮回填中最多重排 MAX_REQUEUE 次，成功即清零；
+    每 15 分钟的定时回填会重置预算，继续兜底。
+    """
+
+    MAX_REQUEUE = 10
 
     def __init__(self, Workers: int):
         self.Queue: queue.Queue[tuple[str, dict | None]] = queue.Queue()
@@ -67,6 +74,7 @@ class SyncWorker:
         self._Guard = threading.Lock()
         self._Workers = Workers
         self._Threads: list[threading.Thread] = []
+        self._Requeues: dict[str, int] = {}
 
     def Start(self) -> None:
         for Index in range(self._Workers):
@@ -87,38 +95,50 @@ class SyncWorker:
         with self._Guard:
             return len(self._Pending)
 
+    def ResetRequeueBudget(self) -> None:
+        """新一轮回填：清空重排计数"""
+        with self._Guard:
+            self._Requeues.clear()
+
     def _Run(self) -> None:
         while True:
             RepoName, Repo = self.Queue.get()
+            Requeue = False
             try:
-                self._SyncWithRetry(RepoName, Repo)
+                Requeue = self._SyncOnce(RepoName, Repo)
             except Exception:  # 兜底，避免工作线程退出
                 logger.exception('同步任务异常：%s', RepoName)
             finally:
                 with self._Guard:
                     self._Pending.discard(RepoName)
                 self.Queue.task_done()
+            if Requeue:
+                self.Put(RepoName, Repo)
 
-    def _SyncWithRetry(self, RepoName: str, Repo: dict | None) -> None:
-        Delays = [10, 30, 60, 120]
-        LastError: Exception | None = None
-        for Attempt, Delay in enumerate([0] + Delays):
-            if Delay:
-                time.sleep(Delay)
-            try:
-                Info = Repo or Gitea.GetRepo(RepoName)
-                if not Info:
-                    raise MirrorError(f'Gitea 中不存在仓库 {RepoName}')
-                Manager.Sync(Info)
-                return
-            except MirrorError as Error:
-                LastError = Error
-                logger.warning('同步失败（第 %s 次）%s：%s', Attempt + 1, RepoName, Error)
-            except Exception as Error:  # 网络异常等
-                LastError = Error
-                logger.warning('同步异常（第 %s 次）%s：%s', Attempt + 1, RepoName, Error)
-        Store.SetStatus(RepoName, Status='failed', LastError=str(LastError)[:1000])
-        logger.error('同步最终失败 %s：%s', RepoName, LastError)
+    def _SyncOnce(self, RepoName: str, Repo: dict | None) -> bool:
+        """执行一次同步；返回 True 表示需要重新排到队尾"""
+        try:
+            Info = Repo or Gitea.GetRepo(RepoName)
+            if not Info:
+                raise MirrorError(f'Gitea 中不存在仓库 {RepoName}')
+            Manager.Sync(Info)
+            with self._Guard:
+                self._Requeues.pop(RepoName, None)
+            return False
+        except Exception as Error:
+            logger.warning('同步失败 %s：%s', RepoName, Error)
+            # 丢弃可能损坏的本地镜像（大仓 HTTP/2 断流后无法续传）
+            Manager.DropLocal(RepoName)
+            with self._Guard:
+                Count = self._Requeues.get(RepoName, 0) + 1
+                self._Requeues[RepoName] = Count
+            if Count <= self.MAX_REQUEUE:
+                Store.SetStatus(RepoName, Status='pending', LastError=str(Error)[:1000])
+                logger.info('已排到队尾（第 %s 次重排）：%s', Count, RepoName)
+                return True
+            Store.SetStatus(RepoName, Status='failed', LastError=str(Error)[:1000])
+            logger.error('超过重排上限，标记失败 %s：%s', RepoName, Error)
+            return False
 
 
 Worker = SyncWorker(Cfg.Concurrency)
@@ -130,6 +150,7 @@ Worker = SyncWorker(Cfg.Concurrency)
 
 def Backfill() -> dict:
     """枚举组织全部仓库并入队（幂等）"""
+    Worker.ResetRequeueBudget()
     Repos = Gitea.ListRepos()
     Queued = 0
     for Repo in Repos:
diff --git a/GitMirror/mirror.py b/GitMirror/mirror.py
index 8f76d53b..0180d567 100644
--- a/GitMirror/mirror.py
+++ b/GitMirror/mirror.py
@@ -21,6 +21,7 @@ import json
 import logging
 import os
 import secrets as py_secrets
+import shutil
 import sqlite3
 import subprocess
 import threading
@@ -372,6 +373,9 @@ class MirrorManager:
         Cmd = [
             'git',
             '-c', 'core.longpaths=true',
+            # 大仓库（数百 MB）走 HTTP/2 常被服务端 reset（curl 92），强制 HTTP/1.1
+            '-c', 'http.version=HTTP/1.1',
+            '-c', 'http.postBuffer=524288000',
             # 清空 credential helper，杜绝全局 GCM/OAuth 凭据抢先命中
             '-c', 'credential.helper=',
         ] + Args
@@ -438,6 +442,21 @@ class MirrorManager:
             logger.info('镜像完成 %s', RepoName)
             return {'RepoName': RepoName, 'GithubName': GithubName, 'Status': 'ok'}
 
+    def DropLocal(self, RepoName: str) -> None:
+        """删除本地 bare 镜像
+
+        大仓库 fetch 中途断流（curl 92 / early EOF）后本地 pack 可能残缺，
+        继续在同一目录重试容易重复失败；直接丢弃，下次从头干净拉起。
+        """
+        Local = os.path.join(self.Cfg.ReposDir, f'{RepoName}.git')
+        if not os.path.isdir(Local):
+            return
+        try:
+            shutil.rmtree(Local)
+            logger.info('已删除本地镜像：%s', RepoName)
+        except OSError as Error:
+            logger.warning('删除本地镜像失败 %s：%s', RepoName, Error)
+
     def HandleRepoDeleted(self, RepoName: str) -> None:
         """源仓库被删除：按配置归档（默认）/ 真删 / 忽略"""
         GithubName = self._GithubName(RepoName)