linux-kernel - Re: [RFC PATCH] Perf Bench: Locking Microbenchmark

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: <1412311972.27162.3.camel@linux-t7sj.site>
Date:	Thu, 02 Oct 2014 21:52:52 -0700
From:	Davidlohr Bueso <dbueso@...e.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Tuan Bui <tuan.d.bui@...com>, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, paulus@...ba.org, acme@...nel.org,
	artagnon@...il.com, jolsa@...hat.com, dvhart@...ux.intel.com,
	Aswin Chandramouleeswaran <aswin@...com>,
	Jason Low <jason.low2@...com>, akpm@...ux-foundation.org
Subject: Re: [RFC PATCH] Perf Bench: Locking Microbenchmark

On Wed, 2014-10-01 at 07:28 +0200, Ingo Molnar wrote:
> If you compare an strace of AIM7 steady state and 'perf bench 
> lock' steady state, is it comparable, i.e. do the syscalls and 
> other behavioral patterns match up?

With more than 1000 users I'm seeing:

-  33.74%    locking-creat  [kernel.kallsyms]              [k] mspin_lock                                                                                                ◆
   + mspin_lock                                                                                                                                                          ▒
   + __mutex_lock_slowpath                                                                                                                                               ▒
   + mutex_lock                                                                                                                                                          ▒
-   7.97%    locking-creat  [kernel.kallsyms]              [k] mutex_spin_on_owner                                                                                       ▒
   + mutex_spin_on_owner                                                                                                                                                 ▒
   + __mutex_lock_slowpath                                                                                                                                               ▒
   + mutex_lock                                                                                                     

Lower users count just shows the syscall entries.

Of course, the aim7 setup was running on a ramdisk, thus avoiding any IO
overhead in the traces.

Thanks,
Davidlohr

--
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/