linux-kernel - Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

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] [day] [month] [year] [list]

Date:	Thu, 29 Mar 2007 22:33:09 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Lee Revell" <rlrevell@...-job.com>
Cc:	"Kevin Perros" <kevin.perros@...e.fr>, John <linux.kernel@...e.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

> The problem could also be something other than SMM, like DMA
> starvation by a video or disk controller.  Try disabling all hard
> drive controllers and booting from a CD or USB stick.

You'll get starvation from the disk DMA but only if you are using the
disk and doing DMA otherwise it won't have much effect. If you drop the
older VIA's down to about UDMA33 or UDMA66 they normally behave
themselves. This is a problem folks see with the older boards and video
capture particularly
-
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/