linux-kernel - Re: [RFT] Port 0x80 I/O speed

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: <20071212004316.079e3a05@Varda>
Date:	Wed, 12 Dec 2007 00:43:16 +0100
From:	Alejandro Riveira Fernández 
	<ariveira@...il.com>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, dpreed@...d.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>, pavel@....cz,
	andi@...stfloor.org, rol@...917.net,
	Krzysztof Halasa <khc@...waw.pl>, david@...idnewall.com,
	hpa@...or.com, john@...ffel.org, linux-os@...logic.com
Subject: Re: [RFT] Port 0x80 I/O speed

El Wed, 12 Dec 2007 00:31:18 +0100
Rene Herman <rene.herman@...il.com> escribió:

> Good day.
> 
> Would some people on x86 (both 32 and 64) be kind enough to compile and run 
> the attached program? This is about testing how long I/O port access to port 
> 0x80 takes. It measures in CPU cycles so CPU speed is crucial in reporting.
> 
> Posted a previous incarnation of this before, buried in the outb 0x80 thread 
> which had a serialising problem. This one should as far as I can see measure 
> the right thing though. Please yell if you disagree...
> 
> For me, on a Duron 1300 (AMD756 chipset) I have a constant:
> 
> rene@...e4:~/src/port80$ su -c ./port80
> cycles: out 2400, in 2400
> 
> and on a PII 400 (Intel 440BX chipset) a constant:
> 
> rene@...p:~/src/port80$ su -c ./port80
> cycles: out 553, in 251
> 
> Results are (mostly) independent of compiler optimisation, but testing with 
> an -O2 compile should be most useful. Thanks!
> 
> Rene.

 On my AMD 3800 X2 (2000MHz) ULi M1697 2.6.24-rc5 i get:

 cycles: out 1844674407370808, in 1844674407369087
 
It is not constant but variations are not significant afaics

--
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/