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]
Date:	Wed, 05 Feb 2014 22:10:34 -0500
From:	Waiman Long <>
To:	Peter Zijlstra <>
CC:	Thomas Gleixner <>,
	Ingo Molnar <>,
	"H. Peter Anvin" <>, Arnd Bergmann <>,,,, Steven Rostedt <>,
	Andrew Morton <>,
	Michel Lespinasse <>,
	Andi Kleen <>,
	Rik van Riel <>,
	"Paul E. McKenney" <>,
	Linus Torvalds <>,
	Raghavendra K T <>,
	George Spelvin <>,
	Tim Chen <>,
	Daniel J Blueman <>,
	Alexander Fyodorov <>,
	Aswin Chandramouleeswaran <>,
	Scott J Norton <>,
	Thavatchai Makphaibulchoke <>
Subject: Re: [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlock

On 02/03/2014 06:40 AM, Peter Zijlstra wrote:
> On Fri, Jan 31, 2014 at 02:24:33PM -0500, Waiman Long wrote:
>> Light contention is the only case where the qspinlock may not perform as
>> good as the ticket spinlock. I know this is the most common case. However, I
>> would argue that the slowdown, if any, will not be really noticeable. This
>> is what I will try to find out.
> Please also explain why things are slower/faster. Thomas tried to get
> you to do so a few months back, but you kept deflecting.

It is not easy to have a test case to test light contention. I am trying 
to create custom test case to get that data.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists