Is it a good idea to use a usb-serial adapter for PPS input? Yes, it is.

[O'Connor, Daniel]

> On 12 Aug 2019, at 09:09, O'Connor, Daniel <darius at dons.net.au> wrote:
>> always get lost on single-core processors which are in cpu_idle() at
>> the time the hardclock interrupt happens.  (But that's fixable by just
>> increasing the number of timehands, I think at least 4 are required.)
> 
> OK, how do I increase the number of clock hands?

I am going to try this diff but buildkernel is going to take a while...

diff --git a/sys/kern/kern_tc.c b/sys/kern/kern_tc.c
index 2656fb4d2..00440b6a2 100644
--- a/sys/kern/kern_tc.c
+++ b/sys/kern/kern_tc.c
@@ -83,8 +83,48 @@ struct timehands {
 	struct timehands	*th_next;
 };

-static struct timehands th0;
+static struct timehands th2;
 static struct timehands th1 = {
+	.th_next = &th2
+};
+
+static struct timehands th3;
+static struct timehands th2 = {
+	.th_next = &th3
+};
+
+static struct timehands th4;
+static struct timehands th3 = {
+	.th_next = &th4
+};
+
+static struct timehands th5;
+static struct timehands th4 = {
+	.th_next = &th5
+};
+
+static struct timehands th6;
+static struct timehands th5 = {
+	.th_next = &th6
+};
+
+static struct timehands th7;
+static struct timehands th6 = {
+	.th_next = &th7
+};
+
+static struct timehands th8;
+static struct timehands th7 = {
+	.th_next = &th8
+};
+
+static struct timehands th9;
+static struct timehands th8 = {
+	.th_next = &th9
+};
+
+static struct timehands th0;
+static struct timehands th9 = {
 	.th_next = &th0
 };
 static struct timehands th0 = {
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum