linux-kernel - Re: lockup when C1E and high-resolution timers enabled

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 15 Jun 2015 01:38:38 +0200
From:	Christoph Fritz <chf.fritz@...glemail.com>
To:	Daniel J Blueman <daniel@...ra.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: lockup when C1E and high-resolution timers enabled

On Sun, 2015-06-14 at 23:24 +0800, Daniel J Blueman wrote:
> val=0x$(setpci -s 00:18.3 0xd4.l) # read D18F3xD4
> val=$((val &~(1 << 13))) # clear bit13 (MTC1eEn)
> setpci -d 1022:1603 0xd4.l=$(printf %x $val) # write back

This slows down the whole system dramatically:

 - before: MTC1eEn set: Booting takes 11 secs
 - after : MTC1eEn cleared: Booting takes 53 secs

--
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/