Waiting for bufdaemon

[Konstantin Belousov]

On Sun, Jan 17, 2021 at 10:37:18AM +0100, Rainer Hurling wrote:
> Am 17.01.21 um 05:33 schrieb Konstantin Belousov:
> > On Sat, Jan 16, 2021 at 07:41:01PM +0100, Rainer Hurling wrote:
> >> During another shutdown after heavy usage of the box, the following
> >> messages were also seen:
> >>
> >>
> >> [...]
> >> Syncing disks, vnodes remaining... 22 EFI rt_settime call faulted, error 14
> >> efirtc0: CLOCK_SETTIME error 14
> > 
> > This means that BIOS code faulted during RTC settime call.  I doubt that
> > it is related.
> > 
> > On the other hand, it is good that the onfault EFI RT code got tested finally.
> > 
> 
> Thanks for clarification :)
> 
> 
> Any chance of getting a fix for the AMD CPUs in the foreseeable future?
> 
> Or should I revert commit 9e680e4005b7 on affected boxes until further
> notice (as a workaround)?

I am working on it, no ETA.

Interesting point would be to check on machines of other testers,
if the following hides the problem.

diff --git a/sys/x86/x86/tsc.c b/sys/x86/x86/tsc.c
index 85924df98312..5700a8ca98e5 100644
--- a/sys/x86/x86/tsc.c
+++ b/sys/x86/x86/tsc.c
@@ -639,7 +639,7 @@ init_TSC_tc(void)
 	 *   on Intel, and MFENCE;RDTSC on AMD.
 	 * - For really old CPUs, just use RDTSC.
 	 */
-	if ((cpu_vendor_id == CPU_VENDOR_AMD ||
+	if (false && (cpu_vendor_id == CPU_VENDOR_AMD ||
 	    cpu_vendor_id == CPU_VENDOR_HYGON) &&
 	    CPUID_TO_FAMILY(cpu_id) >= 0x17) {
 		tsc_timecounter.tc_get_timecount = shift > 0 ?