linux-kernel - Re: Do we need to call calibrate_delay() for all cores/hyperthreads on a socket?

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] [day] [month] [year] [list]

Message-ID: <20101203154109.GC8800@basil.fritz.box>
Date:	Fri, 3 Dec 2010 16:41:09 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Robin Holt <holt@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...nel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>
Subject: Re: Do we need to call calibrate_delay() for all
 cores/hyperthreads on a socket?

> If, on the other hand, we do it per core, it ends up only reducing boot
> time by 121 seconds.  An improvement for sure, but not good enough to
> make me really happy ;).

If you parallelize it you can be even faster.
-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/