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Message-ID: References: <29775afa-e17b-4c44-a2a8-4ef4bc7cdf0f@suse.com> <88c65ec7-b7f7-4d8b-a453-d707440b43cb@suse.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="IAFUchFxljARC2be" Content-Disposition: inline In-Reply-To: X-purgate-ID: tlsNG-ebf023/1775224512-3212551B-8CF3F5C1/0/0 X-purgate-type: clean X-purgate-size: 1836 --IAFUchFxljARC2be Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Fri, 3 Apr 2026 15:55:07 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Jan Beulich Cc: xen-devel , =?utf-8?B?SsO8cmdlbiBHcm/Dnw==?= , Roger Pau =?utf-8?B?TW9ubsOp?= Subject: Re: Slow (higher scheduling latency?) system after S3 - regression 4.17 -> 4.19 ? On Thu, Apr 02, 2026 at 03:02:15PM +0200, Marek Marczykowski-G=C3=B3recki w= rote: > On Fri, Mar 27, 2026 at 01:47:55PM +0100, Marek Marczykowski-G=C3=B3recki= wrote: > > Some further observation, this time regarding timers: >=20 > In the meantime Roger suggested it might be about C-states. So, I just > tried booting with max_cstate=3D0. I got this: We had a design session on this issue, and managed to find (thanks Roger!) that adding: tsc_mode=3D'always_emulate' to the domU config fixes the issue. Now, the question is how to fix it properly... --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --IAFUchFxljARC2be Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmnPxrsACgkQ24/THMrX 1yxMjQf+ISAAxXFtNjrTNrWA/GXqU1GQjp3JY1Rcze1mkNkMkDtKcd7C4f8A4ing o5uwsZJhHAjOxHqt3RN0RoWw1gb5q70aOe50sBmtZ7+AEQI9LRHHh3Ug2v6v6PS2 7QFN7PrBG6Nh4Q34YzMZ5koZwoJDUJCghGprhR8L+tP/dIgSrMDPIlK0+JcVrXRm U5uRHG4XYGrRvRSYt0xw8a3zkN2fz2F1KZ51oud9eBacDZeR4YeTrWP0zZAepxP2 qCTnGJiSmu6TJ24kcgb3k0wPxSR+wGDMSdT5DIFzKL77RRMZMtGhEdI47ocwTExh ZLwXbVvdkB46Y1iKzqTHEKrcDjBaiw== =wCLO -----END PGP SIGNATURE----- --IAFUchFxljARC2be--