From: Stephen Hemminger <stephen@networkplumber.org>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: Isaac Boukris <iboukris@gmail.com>, <dev@dpdk.org>,
<roretzla@linux.microsoft.com>, <dmitry.kozliuk@gmail.com>,
<david.marchand@redhat.com>
Subject: Re: [PATCH v5 2/2] timer: allow platform to override cpu TSC frequency
Date: Thu, 3 Oct 2024 08:14:27 -0700 [thread overview]
Message-ID: <20241003081427.181eb2d2@hermes.local> (raw)
In-Reply-To: <Zv6kzk_6UxIQIBVY@bricha3-mobl1.ger.corp.intel.com>
On Thu, 3 Oct 2024 15:06:06 +0100
Bruce Richardson <bruce.richardson@intel.com> wrote:
> On Thu, Oct 03, 2024 at 03:26:04PM +0300, Isaac Boukris wrote:
> > The CPU provided value is often not accurate, allow overriding it
> > based on info from the host OS.
> >
> > On Linux X86, if the tsc_known_freq cpu flag is missing, it means
> > the kernel doesn't trust it and calculates its own. We should do
> > the same to avoid drift.
> >
> > On freebsd we have access to the kernel tsc_hz value, just use it.
> >
> > Signed-off-by: Isaac Boukris <iboukris@gmail.com>
> > ---
> Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
prev parent reply other threads:[~2024-10-03 15:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-21 14:00 [PATCH 1/2] timer/linux: lower rounding of tsc estimation to 10KHz Isaac Boukris
2024-09-21 14:00 ` [PATCH 2/2] timer/linux: override TSC freq if no tsc_known_freq Isaac Boukris
2024-09-24 17:04 ` Isaac Boukris
2024-09-30 15:04 ` Bruce Richardson
2024-09-30 22:08 ` [PATCH v2 0/2] Improve TSC frequency accuracy on Linux Isaac Boukris
2024-09-30 22:08 ` [PATCH v2 1/2] timer/linux: lower rounding of tsc estimation to 100KHz Isaac Boukris
2024-09-30 22:08 ` [PATCH v2 2/2] timer/linux/x86: override TSC freq if no tsc_known_freq Isaac Boukris
2024-10-01 0:10 ` Stephen Hemminger
2024-10-01 0:22 ` [PATCH v3 0/2] Improve TSC frequency accuracy on Linux Isaac Boukris
2024-10-01 0:22 ` [PATCH v3 1/2] timer/linux: lower rounding of tsc estimation to 100KHz Isaac Boukris
2024-10-01 15:18 ` Stephen Hemminger
2024-10-01 0:22 ` [PATCH v3 2/2] timer/linux/x86: override TSC freq if no tsc_known_freq Isaac Boukris
2024-10-01 15:19 ` Stephen Hemminger
2024-10-01 21:56 ` Isaac Boukris
2024-10-01 20:01 ` Bruce Richardson
2024-10-01 21:59 ` Isaac Boukris
2024-10-02 8:06 ` Bruce Richardson
2024-10-02 16:56 ` [PATCH v4 0/2] Improve TSC frequency accuracy Isaac Boukris
2024-10-02 16:56 ` [PATCH v4 1/2] timer: lower rounding of TSC estimation to 100KHz Isaac Boukris
2024-10-02 16:56 ` [PATCH v4 2/2] timer: allow platform to override cpu TSC frequency Isaac Boukris
2024-10-02 17:11 ` Bruce Richardson
2024-10-02 19:14 ` Isaac Boukris
2024-10-03 9:31 ` Bruce Richardson
2024-10-03 12:29 ` Isaac Boukris
2024-10-02 17:12 ` [PATCH v4 0/2] Improve TSC frequency accuracy Bruce Richardson
2024-10-03 12:26 ` [PATCH v5 " Isaac Boukris
2024-10-03 12:26 ` [PATCH v5 1/2] timer: lower rounding of TSC estimation to 100KHz Isaac Boukris
2024-10-03 14:05 ` Bruce Richardson
2024-10-03 15:13 ` Stephen Hemminger
2024-10-08 7:56 ` David Marchand
2024-10-03 12:26 ` [PATCH v5 2/2] timer: allow platform to override cpu TSC frequency Isaac Boukris
2024-10-03 14:06 ` Bruce Richardson
2024-10-03 15:14 ` Stephen Hemminger [this message]
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