Date: Sat, 19 Feb 2022 20:23:41 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: Mike Karels <mike@karels.net>, Tomoaki AOKI <junchoon@dec.sakura.ne.jp>, "Chen, Alvin W" <Weike.Chen@dell.com>, freebsd-current@freebsd.org Subject: Re: [Intel AlderLake] Read&Write files to FAT32 or UFS partition cause data corrupt due to P-Core&E-Core Message-ID: <YhE1rWoA%2BhMfebq/@kib.kiev.ua> In-Reply-To: <bc01426a-9750-a161-0bfa-e1acd5299f81@FreeBSD.org> References: <PH0PR19MB4938FC8E343F7AA23F66C7439E349@PH0PR19MB4938.namprd19.prod.outlook.com> <PH0PR19MB4938BC329E905FA3BFC93EBB9E359@PH0PR19MB4938.namprd19.prod.outlook.com> <PH0PR19MB49388A4BC14B16FCEA5F742D9E359@PH0PR19MB4938.namprd19.prod.outlook.com> <5fd2a34e-1135-4237-a028-d4566ff65c69@FreeBSD.org> <20220219115534.7db1b9f199c10894e4280b33@dec.sakura.ne.jp> <7A743668-B5AA-4679-9F56-9A6220CBBC14@karels.net> <bc01426a-9750-a161-0bfa-e1acd5299f81@FreeBSD.org>
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On Sat, Feb 19, 2022 at 12:14:16PM -0500, Alexander Motin wrote: > On 19.02.2022 12:02, Mike Karels wrote: > > On 18 Feb 2022, at 20:55, Tomoaki AOKI wrote: > > > Just a thought, but can it be the reason with timing (e.g., rendezvous > > > within (i)threads, hardware controlls without using hardware timer) > > > problem? > > > > > > On FreeBSD, IIUC, multi processor (multi core) implementation assumes > > > SMP (differs only clock speed) and end up with difference of > > > performance at same clock speed within P-core and E-core, possibly. > > > > Another possibility is that the system is confused by having hyperthreading > > on the P cores but not the E cores. > > No, I've tried to disable SMT and different number of cores to make it look > identical and uniform for the scheduler. The only thing I could not test is > disabling all P cores to test only E, the motherboard does not allow that, > requiring at least one P core enabled. Does the kernel select MWAIT as the idle method? If you set idle to spin, is anything change?
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