Date: Wed, 5 Mar 2014 01:34:10 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r262765 - head/sys/amd64/amd64 Message-ID: <201403050134.s251YAcb024215@svn.freebsd.org>
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Author: emaste Date: Wed Mar 5 01:34:10 2014 New Revision: 262765 URL: http://svnweb.freebsd.org/changeset/base/262765 Log: Disable amd64 TLB Context ID (pcid) by default for now There are a number of reports of userspace application crashes that are "solved" by setting vm.pmap.pcid_enabled=0, including Java and the x11/mate-terminal port (PR ports/184362). I originally planned to disable this only in stable/10 (in r262753), but it has been pointed out that additional crash reports on HEAD are not likely to provide new insight into the problem. The feature can easily be enabled for testing. Modified: head/sys/amd64/amd64/pmap.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Wed Mar 5 01:33:15 2014 (r262764) +++ head/sys/amd64/amd64/pmap.c Wed Mar 5 01:34:10 2014 (r262765) @@ -367,7 +367,7 @@ static int pmap_flags = PMAP_PDE_SUPERPA static struct unrhdr pcid_unr; static struct mtx pcid_mtx; -int pmap_pcid_enabled = 1; +int pmap_pcid_enabled = 0; SYSCTL_INT(_vm_pmap, OID_AUTO, pcid_enabled, CTLFLAG_RDTUN, &pmap_pcid_enabled, 0, "Is TLB Context ID enabled ?"); int invpcid_works = 0;
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