Date: Sun, 29 Dec 2013 03:43:25 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r260031 - head/sys/rpc Message-ID: <201312290343.rBT3hPmZ026237@svn.freebsd.org>
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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); }
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