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Disable amd64 TLB Context ID (pcid) by default for now

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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.
This commit is contained in:
emaste 2014-03-05 01:34:10 +00:00
parent d68939d236
commit 2ab45c505b
1 changed files with 1 additions and 1 deletions
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2
sys/amd64/amd64/pmap.c
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@ -367,7 +367,7 @@ static int pmap_flags = PMAP_PDE_SUPERPAGE; /* flags for x86 pmaps */
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;