linux-kernel - Re: Calculating time in order of 0.1usec on x86 system

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: <215667.93774.qm@web30102.mail.mud.yahoo.com>
Date:	Tue, 30 Sep 2008 02:37:57 -0700 (PDT)
From:	Parav Pandit <paravpandit@...oo.com>
To:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: Calculating time in order of 0.1usec on x86 system

I am getting my desired numbers.
get_cycles()/cpu_khz gives the right time interval on x86 system.

Parav



--- On Tue, 9/30/08, Parav Pandit <paravpandit@...oo.com> wrote:

> From: Parav Pandit <paravpandit@...oo.com>
> Subject: Calculating time in order of 0.1usec on x86 system
> To: "Linux kernel" <linux-kernel@...r.kernel.org>
> Date: Tuesday, September 30, 2008, 12:31 PM
> Hi,
> 
> I need to calculate time spent by a function in order of
> less then a microsecond on x86 SMP platform.
> 
> Current profiling tools and gettimeofday() are not
> sufficient.
> 
> So I am using get_cycles() to get the CPU cycles.
> 
> Now how do I convert it into the time interval?
> 
> Do I have to divide it by "cpu_khz" variable? Or
> some other method?
> Is yes, what will be the unit of the result (time
> interval)? nsec/usec/msec?
> 
> e.g. get_cycles()/cpu_khz (unit?)
> 
> Or Is there more simpler method exist?
> 
> Regards,
> Parav Pandit
> 
> 
>       
> --
> 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/


      
--
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/