linux-kernel - Re: increased number of cycles

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]

Date:	Sun, 18 Nov 2007 09:39:29 -0500
From:	Mark Lord <lkml@....ca>
To:	kernel coder <lhrkernelcoder@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: increased number of cycles

kernel coder wrote:
> hi,
>         I'm trying to add some code to netif_receive_skb function in
> dev.c file . The cycles consumed by that code was around 16 cycles on
> Dual Core Opetron machine.I'm working on that code for last 6 months
> now and the consumed cycles have always been around 16 cycles .I don't
> touch any other part of kernel .
> 
> But for last 4 days the consumed cycles have suddenly increased to
> around 35 cycles . I'm using RDTSC instruction to profile the
> code.There is no change in code and the kernel version is also the
> same .I am assuming that there  must be something wrong with hardware.
..

A cache miss ?
-
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/