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Re: Slow (higher scheduling latency?) system after S3 - regression 4.17 -> 4.19 ?
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Apr 2026 08:14:42 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jürgen Groß <jgross@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 07 Apr 2026 06:14:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.04.2026 15:55, Marek Marczykowski-Górecki wrote:
> On Thu, Apr 02, 2026 at 03:02:15PM +0200, Marek Marczykowski-Górecki wrote:
>> On Fri, Mar 27, 2026 at 01:47:55PM +0100, Marek Marczykowski-Górecki wrote:
>>> Some further observation, this time regarding timers:
>>
>> In the meantime Roger suggested it might be about C-states. So, I just
>> tried booting with max_cstate=0. I got this:
>
> We had a design session on this issue, and managed to find (thanks Roger!)
> that adding:
>
> tsc_mode='always_emulate'
>
> to the domU config fixes the issue. Now, the question is how to fix it
> properly...
Seeing also the remarks on Matrix, what we will hence need to figure is what
TSC parameters (of the system and/or the VM) change across suspend. As per
Matrix everything looked at so far was apparently stable.
Jan
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