linux-kernel - Limiting DMA speeds for individual IDE drives

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-next>] [day] [month] [year] [list]

Date:	Tue, 8 Sep 2009 12:03:48 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	linux-ide@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Limiting DMA speeds for individual IDE drives

Is there any simple way to force the old IDE driver to limit the DMA
speed for a particular device?

I've got a situation where a drive claims to be capable of supporting
UDMA/100, but it's in a noisy environment and gets lots of errors at
that speed.  I'd like to limit it to UDMA/66 or even UDMA/33.

The hdparm command should be able to do this but I can't run it until 
the system has booted, by which time a bunch of CRC and possibly other 
errors have already occurred.  Ideally it should be possible to limit 
the speed starting as early as device detection, but I can't find any 
way to do it.  Is there support for such a thing or will I have to hack 
it in?

Thanks,

Alan Stern

--
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/