Page MenuHomeFreeBSD
Files F163259309

D12277.diff
No OneTemporary
Actions

D12277.diff
View Options

Index: FreeBSD/sys/x86/x86/mca.c
===================================================================
--- FreeBSD/sys/x86/x86/mca.c
+++ FreeBSD/sys/x86/x86/mca.c
@@ -127,6 +127,7 @@
static struct cmc_state **cmc_state; /* Indexed by cpuid, bank. */
static struct amd_et_state *amd_et_state; /* Indexed by cpuid. */
static int cmc_throttle = 60; /* Time in seconds to throttle CMCI. */
+static int cmc_backoff = 1; /* Throttling exponential backoff factor. */
static int amd_elvt = -1;
@@ -579,12 +580,16 @@
* If an interrupt was received less than cmc_throttle seconds
* since the previous interrupt and the count from the current
* event is greater than or equal to the current threshold,
- * double the threshold up to the max.
+ * exponentially increase the threshold up to the max.
*/
if (mode == CMCI && valid) {
if (delta < cmc_throttle && count >= limit &&
limit < max_threshold) {
- limit = min(limit << 1, max_threshold);
+ limit <<= cmc_backoff;
+ if (limit < cur_threshold)
+ limit = max_threshold;
+ else
+ limit = min(limit, max_threshold);
}
return (limit);
}
@@ -835,6 +840,10 @@
"cmc_throttle", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&cmc_throttle, 0, sysctl_positive_int, "I",
"Interval in seconds to throttle corrected MC interrupts");
+ SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO,
+ "cmc_backoff", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ &cmc_backoff, 0, sysctl_positive_int, "I",
+ "Backoff factor while throttling (2 ** value)");
}
static void
@@ -847,6 +856,10 @@
"cmc_throttle", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&cmc_throttle, 0, sysctl_positive_int, "I",
"Interval in seconds to throttle corrected MC interrupts");
+ SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO,
+ "cmc_backoff", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ &cmc_backoff, 0, sysctl_positive_int, "I",
+ "Backoff factor while throttling (2 ** value)");
}
#endif

File Metadata

Mime Type
text/plain
Expires
Wed, Jul 22, 12:40 PM (19 m, 58 s)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
35364421
Default Alt Text
D12277.diff (1 KB)

Event Timeline