Re: Waiting for bufdaemon

From: Rainer Hurling <rhurlin_at_gwdg.de>
Date: Wed, 20 Jan 2021 19:05:00 +0100
Am 20.01.21 um 15:36 schrieb Rainer Hurling:
> Am 20.01.21 um 14:52 schrieb Konstantin Belousov:
>> On Wed, Jan 20, 2021 at 02:35:59PM +0100, Rainer Hurling wrote:
>>> Am 20.01.21 um 14:12 schrieb Konstantin Belousov:
>>>> On Wed, Jan 20, 2021 at 01:56:57PM +0100, Rainer Hurling wrote:
>>>>> Am 20.01.21 um 13:34 schrieb Konstantin Belousov:
>>>>>> On Wed, Jan 20, 2021 at 01:17:51PM +0100, Rainer Hurling wrote:
>>>>>>> Am 20.01.21 um 11:18 schrieb Konstantin Belousov:
>>>>>>>> On Wed, Jan 20, 2021 at 11:02:21AM +0100, Jakob Alvermark wrote:
>>>>>>>>> This patch hides the problem for me. The system seems to work better now.
>>>>>>>>>
>>>>>>>>> No waiting on reboot, and the webcam works better.
>>>>>>>> I am curious what do you mean by the above reference to webcam.
>>>>>>>> Can you explain it with more details, even if only the impressions?
>>>>>>>
>>>>>>> I should mention, that beside the already discussed timing problem with
>>>>>>> bufdaemon, I also have problems with several apps:
>>>>>>>
>>>>>>>
>>>>>>> After a high system load, several programs only react very slowly (e.g.
>>>>>>> Firefox). Several dockable apps from WindowMaker, but also e.g. conky do
>>>>>>> not update their windows anymore, they freeze. After some time, Firefox
>>>>>>> updates its screen content only after switching back from another window ...
>>>>>>>
>>>>>>> When such frozen programs are killed and restarted, they run normally
>>>>>>> again for an indefinite time before they freeze again.
>>>>>>>
>>>>>>> These symptoms completely disappeared, after I patched the Ryzen box as
>>>>>>> suggested on 01/17:
>>>>>>
>>>>>> Do you load latest microcode update from devcpu-data?
>>>>>
>>>>> Yes, sysutils/devcpu-data is installed and the following to lines are in
>>>>> /boot/loader.conf
>>>>>
>>>>> cpu_microcode_load="YES"
>>>>> cpu_microcode_name="/boot/firmware/intel-ucode.bin"
>>>>>
>>>>> But isn't this just for Intel (i387 and amd64), not AMD cpus?
>>>> You need microcode_update_enable="YES" in /etc/rc.conf for late microcode
>>>> update.
>>>>
>>>> I think that early boot update should work on AMD, bit for this you need to
>>>> select and put right blob.  It is enough to load late to answer my question.
>>>
>>> Ah, ok. Thanks for clarification. I also put cpu_microcode_load="YES" in
>>> /etc/rc.conf for a late update.
>>>
>>> Should I try again without your patch of sys/x86/tsc.c, whether the
>>> problem still occurs?
> 
> Unfornately, without the patch from 01/17 the problem is _not_ solved.
> 
> Next I will try your patch from today, f lib/libc/x86/sys/__vdso_gettc.c
> an lib/libc/x86/sys/__vdso_gettc.c ...

I can confirm that this patch also works for me on Ryzen 3950X. No more
bufdaemon waitings, no frozen apps, ...

> 
> 
>> Yes.
>>
>>>
>>>
>>> And for the early boot update, how do I know about the right blob?
>> I am not aware of the mechanism.  My best suggestion is that you match
>> the blob against your CPU family/model id manually.
>>
>>>
>>>>
>>>>>
>>>>>> It might be not enough, which means that additionally latest BIOS needs
>>>>>> to be flushed.
>>>>>>
>>>>>
>>>>> I am running latest Firmware F31 on a "Gigabyte\ Aorus\ X570\ Elite"
>>>>> mainboard.
Received on Wed Jan 20 2021 - 17:05:10 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:26 UTC