Author: imp
Date: Thu Aug 24 22:11:10 2017
New Revision: 322863
URL: https://svnweb.freebsd.org/changeset/base/322863
Log:
Expand the latency tracking array from 1.024s to 8.192s to help track
extreme outliers from dodgy drives. Adjust comments to reflect this,
and make sure that the number of latency buckets match in the two
places where it matters.
Modified:
head/sys/cam/cam_iosched.c
Modified: head/sys/cam/cam_iosched.c
==============================================================================
--- head/sys/cam/cam_iosched.c Thu Aug 24 22:10:58 2017 (r322862)
+++ head/sys/cam/cam_iosched.c Thu Aug 24 22:11:10 2017 (r322863)
@@ -233,7 +233,7 @@ struct iop_stats {
uint32_t state_flags;
#define IOP_RATE_LIMITED 1u
-#define LAT_BUCKETS 12 /* < 1ms < 2ms ... 512ms < 1024ms >
1024ms */
+#define LAT_BUCKETS 15 /* < 1ms < 2ms ... < 2^(n-1)ms >=
2^(n-1)ms*/
uint64_t latencies[LAT_BUCKETS];
struct cam_iosched_softc *softc;
@@ -1520,7 +1520,7 @@ isqrt64(uint64_t val)
return res;
}
-static sbintime_t latencies[] = {
+static sbintime_t latencies[LAT_BUCKETS - 1] = {
SBT_1MS << 0,
SBT_1MS << 1,
SBT_1MS << 2,
@@ -1531,7 +1531,10 @@ static sbintime_t latencies[] = {
SBT_1MS << 7,
SBT_1MS << 8,
SBT_1MS << 9,
- SBT_1MS << 10
+ SBT_1MS << 10,
+ SBT_1MS << 11,
+ SBT_1MS << 12,
+ SBT_1MS << 13 /* 8.192s */
};
static void
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