linux-kernel - Re: [PATCH] x86: intel_epb: Add earlyparam option to keep bias at performance

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <977d3c0e-0fa6-440c-9ade-dac8ad93b898@intel.com>
Date:   Tue, 5 Dec 2023 07:27:59 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     pdurrant@...zon.co.uk, bp@...en8.de, dave.hansen@...ux.intel.com,
        hdegoede@...hat.com, hpa@...or.com, jalliste@...zon.co.uk,
        juew@...zon.com, len.brown@...el.com, linux-kernel@...r.kernel.org,
        mingo@...hat.com, peterz@...radead.org, rafael.j.wysocki@...el.com,
        tglx@...utronix.de, usama.arif@...edance.com, x86@...nel.org
Subject: Re: [PATCH] x86: intel_epb: Add earlyparam option to keep bias at
 performance

On 12/5/23 07:19, Dave Hansen wrote:
> We could, for instance just support this pair:
> 
> 	intel_epb=auto		(default, will hack performance=>normal)
> 	intel_epb=preserve	(leave it alone)
> 
> for now. 

Oh, and in code, this is literally as simple as:

-early_param("intel_epb_no_override", intel_epb_no_override_setup);
+early_param("intel_epb=preserve", intel_epb_no_override_setup);

You don't even need to go looking for "=auto" if you only have one other
option.