From: Andi Kleen <ak@suse.de>
To: Bernhard Kaindl <bkaindl@ffii.org>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Bernhard Kaindl <bk@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: remote debugging via FireWire * __fast__ firedump!
Date: Tue, 4 Dec 2007 08:39:38 +0100 [thread overview]
Message-ID: <200712040839.39984.ak@suse.de> (raw)
In-Reply-To: <alpine.DEB.0.9999.0712040426100.3769@vic.ffii.org>
On Tuesday 04 December 2007 04:45:22 am Bernhard Kaindl wrote:
> I just wanted to let you know that I'll have picked up the early
> firewire patch again and cleaned it up very much so that it should
> be ready to submit it and but it on the patch-submission road.
Nice.
> I have just had the guts to explore __fast__ memory dumping over
> firewire for full-system dumps (reading quadlets is __painfully__
> show if you want to read 2GB of memory over the bus, you only get
> about some some kilobytes each second) using raw1394_start_read()
> to allow also block reads instead of just quatlet reads.
Unfortunately it won't work for >3GB or so AFAIK.
> The biggest block size that worked here was 2048 bytes, which was
> enough to get nearly 10MB/s of data transfer rate from the remote
> memory to disk. Dumping 2GB of remote memory was just a matter of
> about 3 few short minutes which quickly ran by.
>
> Afterwards, the victim was dead (I excluded the low MB of memory,
> so something else must have caused this), at least the start of
Did you run into the PCI memory hole below 4GB?
I suppose the best way would be to require a System.map and
then read e820.nr_map/e820.map[] and only dump real memory.
-Andi
next prev parent reply other threads:[~2007-12-04 21:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-10 11:42 What will be in the x86-64/x86 2.6.21 merge Andi Kleen
2007-02-10 13:43 ` [discuss] " Muli Ben-Yehuda
2007-02-10 13:52 ` Andi Kleen
2007-02-10 13:56 ` Muli Ben-Yehuda
2007-02-10 14:03 ` Andi Kleen
2007-02-10 13:51 ` remote debugging via FireWire (was What will be in the x86-64/x86 2.6.21 merge) Stefan Richter
2007-02-10 14:02 ` Andi Kleen
2007-02-10 15:14 ` remote debugging via FireWire Stefan Richter
2007-02-10 15:41 ` Andi Kleen
2007-02-10 19:16 ` Stefan Richter
2007-02-11 21:35 ` Benjamin Herrenschmidt
2007-02-12 6:49 ` Andi Kleen
2007-02-12 7:29 ` Benjamin Herrenschmidt
2007-12-04 3:45 ` remote debugging via FireWire * __fast__ firedump! Bernhard Kaindl
2007-12-04 7:39 ` Andi Kleen [this message]
2007-12-06 16:02 ` Bernhard Kaindl
2007-12-04 22:15 ` Stefan Richter
2007-12-04 22:34 ` Stefan Richter
2007-12-04 22:40 ` Stefan Richter
2007-12-06 18:36 ` [feedback discussion] Early boot debugging via FireWire (ohci1394_dma=early) Bernhard Kaindl
2007-12-06 19:23 ` Stefan Richter
2007-12-06 19:23 ` [PATCH] " Bernhard Kaindl
2007-12-06 20:23 ` Stefan Richter
2007-12-17 13:49 ` Ingo Molnar
2007-12-06 16:32 ` remote debugging via FireWire * __fast__ firedump! Bernhard Kaindl
2007-02-12 14:11 ` What will be in the x86-64/x86 2.6.21 merge James Morris
2007-02-12 14:14 ` Andi Kleen
2007-02-12 14:46 ` James Morris
2007-02-14 6:53 ` Rusty Russell
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=200712040839.39984.ak@suse.de \
--to=ak@suse.de \
--cc=benh@kernel.crashing.org \
--cc=bk@suse.de \
--cc=bkaindl@ffii.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stefanr@s5r6.in-berlin.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).