From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: "Xen-Devel (E-mail)" <xen-devel@lists.xensource.com>
Subject: Re: softtsc for PV guests
Date: Fri, 21 Aug 2009 16:02:18 -0700 [thread overview]
Message-ID: <4A8F277A.7080103@goop.org> (raw)
In-Reply-To: <baf1d6fd-a41b-45e9-b00b-7df738c9f79d@default>
On 08/21/09 15:17, Dan Magenheimer wrote:
> I'm starting to play with implementing softtsc for
> PV guests, but am not adequately familiar with the low
> level x86 instruction set or emulation code in Xen.
>
> The attached patch seems to work fine for awhile.
> Dom0 begins the boot process and the printk added
> to traps.c observes more than 256K TSC traps (mostly
> in the BogoMIPS calculation) and continues on loading
> drivers etc but eventually freezes after:
>
The Xen clocksource uses rdtsc extensively for timing; emulating it
would be a bad idea. I guess it would make some sense to emulate
usermode rdtsc, but it shouldn't affect kernel rdtscs.
> device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised: dm-devel@redhat.com
> kjournald starting. Commit interval 5 seconds
> EXT3-fs: mounted filesystem with ordered data mode.
>
> Any ideas on what might be stopping the dom0 boot?
>
How dead is the system? Does it respond to sysrq-p? 'q' or '0' on the
Xen console?
J
next prev parent reply other threads:[~2009-08-21 23:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-21 22:17 softtsc for PV guests Dan Magenheimer
2009-08-21 23:02 ` Jeremy Fitzhardinge [this message]
2009-08-21 23:31 ` Dan Magenheimer
2009-08-21 23:38 ` Dan Magenheimer
2009-08-21 23:59 ` Jeremy Fitzhardinge
2009-08-23 16:42 ` Dan Magenheimer
2009-08-23 17:03 ` Jeremy Fitzhardinge
2009-08-23 19:26 ` Dan Magenheimer
2009-08-24 16:43 ` Jeremy Fitzhardinge
2009-08-24 17:58 ` Dan Magenheimer
2009-08-24 21:20 ` Dan Magenheimer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4A8F277A.7080103@goop.org \
--to=jeremy@goop.org \
--cc=dan.magenheimer@oracle.com \
--cc=xen-devel@lists.xensource.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.