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Date: Mon, 21 Oct 2013 00:50:45 +0200
From: magnum <john.magnum@...hmail.com>
To: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com>
Subject: Bad version of Intel OpenCL CPU driver
This is Intel's CPU driver currently installed in Well:
Platform #1 name: Intel(R) OpenCL
Platform version: OpenCL 1.2 LINUX
Device #0 (4) name: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
Device vendor: Intel(R) Corporation
Device type: CPU (LE)
Device version: OpenCL 1.2 (Build 67279)
Driver version: 1.2
Native vector widths: char 32, short 16, int 8, long 8
Preferred vector width: char 1, short 1, int 1, long 1
Global Memory: 31.0 GB
Global Memory Cache: 256.2 KB
Local Memory: 32.0 KB (Global)
Max memory alloc. size: 7.0 GB
Max clock (MHz) : 4294970796
Max Work Group Size: 1024
Parallel compute cores: 8
Apparently this CPU is clocked at four peta-hertz, wow. That is just the
first sign of how poor this driver is. Here's an example of trying to
use it with phpass-opencl:
Device 4: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
Stack dump:
0. :73:13 <Spelling=:22:49>: current parser token ')'
1. :64:1: parsing function body 'md5'
2. :64:1: in compound statement ('{}')
Segmentation fault (core dumped)
It dies from this statement in line 73 of phpass kernel:
a = ROTATE_LEFT(a, S11);
...and ROTATE_LEFT is defined in line 22:
#define ROTATE_LEFT(x, s) rotate(x,(uint)s)
Wat. It's not even complicated code at all. I get similar problems all
the time. This driver is even crappier than Apple's nvidia driver and I
thought noone would ever beat that record.
magnum
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