Date: Wed, 8 Sep 2021 09:01:56 -0700 From: John Baldwin <jhb@FreeBSD.org> To: Colin Percival <cperciva@FreeBSD.org>, src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: a8b89dff6ac0 - main - Disable acpi_timer_test by default Message-ID: <f1030cac-a17b-727a-472e-d3d90933da2b@FreeBSD.org> In-Reply-To: <202109080132.1881WXPv069848@gitrepo.freebsd.org> References: <202109080132.1881WXPv069848@gitrepo.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 9/7/21 6:32 PM, Colin Percival wrote: > The branch main has been updated by cperciva: > > URL: https://cgit.FreeBSD.org/src/commit/?id=a8b89dff6ac026e60983824889d3666842ff409b > > commit a8b89dff6ac026e60983824889d3666842ff409b > Author: Colin Percival <cperciva@FreeBSD.org> > AuthorDate: 2021-09-07 23:59:45 +0000 > Commit: Colin Percival <cperciva@FreeBSD.org> > CommitDate: 2021-09-08 01:31:55 +0000 > > Disable acpi_timer_test by default > > This disables testing the ACPI timer by default, forcing the use of > ACPI-fast rather than ACPI-safe. The broken-ACPI-timers workaround > can be re-enabled by setting the hw.acpi.timer_test_enabled=1 tunable. > > This speeds up the FreeBSD boot process by 140 ms on an EC2 c5.xlarge > instance. > > This change will not be MFCed. > > Assuming no problems are reported, acpi_timer_test, the associated > tunable, and the ACPI-safe timecounter should be removed in FreeBSD 15. > > Relnotes: The ACPI-safe timer is disabled in favour of ACPI-fast; > if timekeeping issues are observed, please test with > hw.acpi.timer_test_enabled=1 in loader.conf and report > if that fixes the problem. Perhaps it should default to '1' for i386 and '0' otherwise? The relevant chipsets were 32-bit only, so this would be a simple way to skip the test for modern hardware, and you could probably MFC that safely. -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?f1030cac-a17b-727a-472e-d3d90933da2b>