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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: Thu, 2 Apr 2026 15:03:36 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jürgen Groß <jgross@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 02 Apr 2026 13:03:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.04.2026 15:02, 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:
>
> [2026-04-02 11:41:57] (XEN) [ 4.327519] mwait-idle: disabled
>
> But then xenpm reports C1 is still used:
Of course, that represents use of the HLT insn.
Jan
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