linux-kernel - Re: [PATCH 3/3] serial: 8250: omap: restore registers on shutdown

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: <CAE21AQoATGZQHUUd3=+A1GZ2wt2vgJSmAUO=MQcnUP5cGK9g6g@mail.gmail.com>
Date:	Fri, 7 Aug 2015 12:41:51 +1200
From:	Charles Manning <cdhmanning@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Ogness <john.ogness@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	nsekhar@...com, nm@...com, linux-serial@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH 3/3] serial: 8250: omap: restore registers on shutdown

On Fri, Aug 7, 2015 at 6:22 AM, Peter Hurley <peter@...leysoftware.com> wrote:
> I agree; this is what we should do first because someone might want it
> for backports.

Got an idea how far this can be ported back?

I'm being hampered by severe performance issues on a
beagleboneblack-like device (am335x) running on 3.18 kernel.

I have a 1Mbaud link that is getting packets of about 22 bytes @800 Hz
and old omap-serial is keeping up, but killing the CPU.

I'm considering backporting 8250_omap as a get out of jail.

Opinions appreciated.

Thanks.
--
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/