Author: mav
Date: Thu Jan 23 00:44:14 2014
New Revision: 261064
URL: http://svnweb.freebsd.org/changeset/base/261064
Log:
MFC r260031:
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:
stable/9/sys/rpc/svc_vc.c
Directory Properties:
stable/9/ (props changed)
stable/9/sys/ (props changed)
Modified: stable/9/sys/rpc/svc_vc.c
==============================================================================
--- stable/9/sys/rpc/svc_vc.c Thu Jan 23 00:43:33 2014 (r261063)
+++ stable/9/sys/rpc/svc_vc.c Thu Jan 23 00:44:14 2014 (r261064)
@@ -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);
}
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