fixes the mentioned axfr problems for me

axfr-fix.diff

Index: pdns/misc.cc
===================================================================
--- pdns/misc.cc	(revision 924)
+++ pdns/misc.cc	(working copy)
@@ -202,6 +202,10 @@
 
     while (replen) {
       ret = write(outsock, buffer, replen);
+      while(ret == -1 && errno == EAGAIN) {
+        Utility::usleep(1);
+        ret = write(outsock, buffer, replen);
+      }
       if(ret < 0)
 	return ret;
       if(!ret)
Index: pdns/tcpreceiver.cc
===================================================================
--- pdns/tcpreceiver.cc	(revision 924)
+++ pdns/tcpreceiver.cc	(working copy)
@@ -376,8 +376,11 @@
     if(!((++count)%chunk)) {
       count=0;
     
-      if(sendDelPacket(outpacket, outsock)<0)  // FIXME: this leaks memory!
-	return 0;
+      if(sendDelPacket(outpacket, outsock)<0) {
+        // FIXME: this leaks memory!
+        L<<Logger::Error<<"AXFR of domain '"<<target<<"' to "<<q->getRemote()<<" FAILED during transmission"<<endl;
+        return 0;
+      }
 
       outpacket=q->replyPacket();  
       outpacket->setCompress(false);