TheGrebs.com:IRC Logs:#xen:2007:03:07

---	Log	opened Wed Mar 07 00:00:14 2007
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05:01	<dev_>	Hi! I'm experiencing the 4GB bug on Xen 3.0.2-2. Me and my colleauges were wondering if that one is fixed or semi-fixed in xen 3.0.4? (http://lists.xensource.com/archives/html/xen-users/2006-12/msg00252.html)
05:27	<am88b>	very odd bug indeed
05:29	<dev_>	jep
05:29	<dev_>	experienced it twice while doing backups at night :-)
05:41	<am88b>	I sure hope you have somekind of very weird configuration and this is not a very common error...
05:41	<am88b>	why not try 3.0.4 ?
05:42	<am88b>	MAYBE it is fixed...
05:42	<dev_>	because it's a production machine
05:42	<am88b>	too bad
05:42	<dev_>	so we can't just mess about with it without being sure its fixed
05:42	<dev_>	we're trying to recreate the problem in our lab
05:42	<dev_>	but until now no luck
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10:32	<hollisb>	interesting, still no xen-unstable updates
10:33	<rharper>	hollisb: I've seen a couple of keir's responses that indicate lots of changes are stuck in staging tree
10:34	<hollisb>	yeah, there are dozens of patches in there
10:34	<hollisb>	I just wonder what's broken
10:34	<rharper>	heh
10:39	<movement>	it sounded like their test suite stuff was borked rather than the codebase
10:39	<hollisb>	that's a bit better I guess
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12:38	<stephan>	hi, i am still working on a fast checkpoint/rollback mechanism. when i try to overwrite the whole memory (except the p2m tables)i get the following errormessage: mm.c:1739:d0 Bad type (saw a8000001 != exp e0000000) for mfn 336c0 (pfn 121a), mm.c:625:d0 Error getting mfn 336c0 (pfn 121a) from L1 entry 336c0027 for dom11. what does this mean? have anyone an idea?
12:40	<stephan>	btw. it is alway the same pfn (121a)
12:41	<brendan>	did you ever track down the grant shared pages?
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12:44	<stephan>	i tried, but i have no clue how to recognize them
12:45	<stephan>	are there any special flags in pagetables for them?
12:45	<brendan>	no
12:45	<brendan>	I am guessing that is still the problem here though
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12:48	<stephan>	i thought i could use GNTTABOP_dump_table but it is removed in xen unstable
12:48	<brendan>	you might be able to coerce something out of the domain builder
12:49	<brendan>	I actually don't remember too clearly how I found them. I think I got linux to tell me the virtual address it was using and walked the page tables to find the pfn
12:49	<brendan>	come to think of it, that approach was used in one of the early versions of the xm checkpoint patches I sent to xen-devel
12:49	<brendan>	so if you dig through the archives, you might find some helpful code
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13:08	<stephan>	ok, found the code, you use the pt_base and nr_pt_frames fields to store the address and the number of grant pages, hmm, dirty, but should work to track down the problem :-)
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13:09	<brendan>	yes, there's no clean mechanism that I'm aware of for that particular problem
13:11	<stephan>	is there any chance to get additional fields in the suspend record for this information or does this break other things in xen?
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13:13	<brendan>	I'm not really sure there. You'd probably be better off asking the list
13:20	<stephan>	ok, i thought you had reasons not add some extra fields
13:21	<brendan>	the reason was I didn't know if it was safe to add new ones :)
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13:25	<stephan>	if grant tables are the problem, i'll try to get these extra fields :)
13:28	<brendan>	the simpler option is probably just to drop and reattach
13:28	<brendan>	that's what checkpoint eventually ended up doing
13:34	<brendan>	yay, stable is unstuck
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13:37	<stephan>	i think it should be s/stable/unstable/ :)
13:38	<brendan>	aye
13:41	<movement>	unstable got unplugged
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13:54	<hollisb>	rharper: did you find an unbroken changeset?
13:55	<rharper>	hollisb: not yet, haven't started just yet
13:55	<hollisb>	ok
13:59	<hollisb>	gah... can anybody in here advocate the new domain builder to me?
13:59	<hollisb>	I need to get in the right mindset to not hate it
14:00	[~]	brendan loves it
14:00	<brendan>	makes elfnotes a lot easier
14:01	<hollisb>	brendan: how's that?
14:01	<brendan>	I have that nice dom struct to pass them around int
14:01	<brendan>	in
14:02	<hollisb>	brendan: it seems to introduce amazing new levels of complexity that didn't exist previously, such as this "segment" concept
14:02	<hollisb>	I used to just map memory and copy in my image
14:02	<hollisb>	now I'm supposed to use a whole new API for "segments" that try to abstract away the fact that I'm mapping in memory and copying my image in
14:03	<hollisb>	I'm missing the point
14:03	[~]	brendan didn't touch any of that stuff
14:03	<hollisb>	hmm
14:03	<hollisb>	brendan: what elfnote stuff?
14:03	<brendan>	I'm surprised you can't just plug in your builder at a slightly higher level though
14:04	<hollisb>	brendan: is that a loader feature?
14:04	<brendan>	libelf-dominfo IIRC
14:04	<hollisb>	brendan: I used to be able to plug in at xc_linux_build(), until your patch :(
14:04	<brendan>	can't you plug in at xc_dom_linux_build?
14:04	<hollisb>	no, that's the new builder. I used to bypass it entirely
14:05	<brendan>	I needed a way to get the elfnotes out of the builder, and didn't want to reparse the image. xc_linux_build doesn't have a way to do that
14:07	<brendan>	xc_dom_linux_build is a wrapper I stuck in just below xc_linux_build. I'm not sure why one's harder to override than the other.
14:08	<hollisb>	brendan: xc_dom_linux_build() is common code
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14:08	<hollisb>	brendan: the only arch code under it is the myriad arch hooks I'm stuggling to comprehend
14:09	<hollisb>	brendan: or you're thinking I can just not build xc_dom_compat_linux.c? hmmm....
14:10	<brendan>	yeah, I was thinking you'd override compat_linux
14:10	<brendan>	(but I don't have any idea how the ppc build process works)
14:11	<hollisb>	there is no magic build process
14:11	<hollisb>	it just works
14:11	<hollisb>	in the Makefile we can mark files to only be built when particular config options are on
14:11	<hollisb>	that's all
14:12	<brendan>	can you switch in your own compat-linux then?
14:14	<brendan>	or #ifdef xc_dom_compat_linux for PPC ?
14:14	<hollisb>	yes, maybe I'll do that and just refactor to provide xc_dom_linux_build()
14:14	<hollisb>	ifdefs are evil
14:14	<brendan>	I think it should be trivial to provide enough xc_dom_linux_build for xc.c
14:14	<hollisb>	yeah
14:14	<hollisb>	I like this idea better
14:15	<hollisb>	brendan: well, but then what is this elfnote stuff that won't work?
14:16	<brendan>	if you don't write to *dom, xc.c simply won't find any elfnotes
14:16	<brendan>	if you later want to add some, just write them in
14:16	<brendan>	no elfnotes in xend is just the status quo ante anyway
14:16	<hollisb>	ahhh, I see
14:17	<hollisb>	looks doable
14:19	<hollisb>	ok it's a plan
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18:48	<Basic_py>	# xm info \| grep free
18:48	<Basic_py>	free_memory : 0
18:48	<Basic_py>	That a bad thing?
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18:51	<aliguori>	only if you care about creating more domains
18:53	<Basic_py>	2G ram, only 768 ram consummed by DomU, dom0-min-mem 64, do I give more dom0-min-mem "fix" the problem?
18:54	<Basic_py>	free in dom0 shows over 1G mem free
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---	Log	closed Thu Mar 08 00:00:58 2007