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From: Alexander Motin <mav@FreeBSD.org>
Date: Sun, 29 Dec 2013 03:43:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r260031 - head/sys/rpc
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Author: mav
Date: Sun Dec 29 03:43:25 2013
New Revision: 260031
URL: http://svnweb.freebsd.org/changeset/base/260031

Log:
  In addition to r259632 completely block receive upcalls if we have more
  data than we need.  This reduces lock pressure from xprt_active() side.

Modified:
  head/sys/rpc/svc_vc.c

Modified: head/sys/rpc/svc_vc.c
==============================================================================
--- head/sys/rpc/svc_vc.c	Sun Dec 29 03:15:15 2013	(r260030)
+++ head/sys/rpc/svc_vc.c	Sun Dec 29 03:43:25 2013	(r260031)
@@ -619,7 +619,15 @@ svc_vc_process_pending(SVCXPRT *xprt)
 		}
 	}
 
-	so->so_rcv.sb_lowat = imax(1, imin(cd->resid, so->so_rcv.sb_hiwat / 2));
+	/*
+	 * Block receive upcalls if we have more data pending,
+	 * otherwise report our need.
+	 */
+	if (cd->mpending)
+		so->so_rcv.sb_lowat = INT_MAX;
+	else
+		so->so_rcv.sb_lowat =
+		    imax(1, imin(cd->resid, so->so_rcv.sb_hiwat / 2));
 	return (TRUE);
 }