linux-kernel - Re: [patch 1/2] fastboot: Add a module parameter to skip probing of specific ports

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: <20080812043603.3d8471d4@infradead.org>
Date:	Tue, 12 Aug 2008 04:36:03 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [patch 1/2] fastboot: Add a module parameter to skip probing of
 specific ports

On Tue, 12 Aug 2008 08:39:03 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> On Mon, 11 Aug 2008 15:36:41 -0700
> Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > 
> > From: Kristen Accardi <kristen.c.accardi@...el.com>
> > Subject: [PATCH] libata: Add a module parameter to skip probing of
> > specific ports
> > 
> > Port probing by libata can easily take 10% or more of the kernel
> > boot time (2%+ of total). For cases where one knows there is nothing
> > connected to certain ports (for example on netbooks) this is a waste
> > of boot time.
> > 
> > This patch adds a module parameter that allows the admin to specify
> > to skip ports (specified by a bitmask) and recoup this boot time.
> > This capability is potentially also useful to get systems to boot
> > for cases where port-probing on a certain ports causes crashes.
> > 
> > A follow-on patch will add the capability to use DMI identification
> > to automate this for certain known systems.
> 
> What happens if I plug in an additional libata using device ?

on an eeepc ? ;)

at least for the command line option the owner (or whoever sets up
grub) knows the order and could adjust. For the DMI patch you do have a
point.

> What
> defines the probe order here particularly as people are pushing for
> parallel probing of multiple devices.

the patches I'm pushing for this don't change probe order; that has
been tried before and wasn't a great success.


-- 
If you want to reach me at my work email, use arjan@...ux.intel.com
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
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/