TheGrebs.com:IRC Logs:#xen:2005:05:02

---	Log	opened Mon May 02 00:00:11 2005
00:03	cilkay	This time, Error 1: Filename must be an absolute pathname or blocklist
00:05	caker	kernel /xen.gz
00:05	caker	module /vmlinuz-2.6.11-xen0 ...
00:05	cilkay	I have: kernel (hd0,0)/xen.gz dom0_mem=131072
00:06	cilkay	module vmlinuz-xen0 root=/dev/sda3 ro console=tty0
00:06	demon	/vmlinuz-xen0
00:07	cilkay	Doing init 6 now - will know in a few minutes.
00:07	cilkay	This machine takes an eon to POST.
00:08	cilkay	aha, booting.
00:09	cilkay	Seems to have found both NICs and the SCSI host adapter.
00:10	cilkay	Root-NFS: No NFS server available, giving up.
00:10	cilkay	Unable to mount root fs via NFS, trying floppy.
00:11	cilkay	I don't recall specifying anywhere that it should attempt to boot via NFS.
00:14	demon	that's what it falls through to if it can't find a local block dev to boot from
00:14	demon	which means you'll have to manually config and build a kernel in the tree it most likely pulled down for you
00:15	cilkay	Could it be that I did not specify the root properly?
00:16	cilkay	/dev/sda3 on / type ext3 (rw) (this is what mount tells me when I boot from the working MDK kernel)
00:18	demon	that's your root dev, yes... it most likely just means that you need to add the appropriate drivers, as the basic configuration that xen uses for the dom0 kernel it builds for you is fairly minimal, and no, it doesn't look at your local config as a basis, or look at PCI devices present, or anything like that
00:19	cilkay	I noticed it detected the SCSI HBA though.
00:19	cilkay	Maybe it didn't load the megaraid module.
00:20	cilkay	I still don't have a good conceptual overview of this thing.
00:20	cilkay	I have the sources for the MDK kernel.
00:20	cilkay	Can I use that and apply a patch for Xen?
00:22	demon	well, xen doesn't patch in per se, it adds several files and subtrees via symlinks... the code it pulls in (2.6.10, for Xen 2.0.5) may not work with 2.6.11, particularly mandrake's (since RH and its evil spawn patch the shit out of the kernel with all sorts of crazy stuff)...
00:23	cilkay	So I should just use the pristine sources from kernel.org that Xen downloaded then.
00:23	demon	yeah, for now, I'd recommend it
00:42		* riel would not be surprised to see readily packaged xen kernels in cooker
00:43	riel	after all, the conectiva people had xen packages before mandrake bought them
00:48	cilkay	riel, I saw UML kernels in Cooker contrib but not Xen in contrib or main.
00:49	riel	mmm ok, then I guess that got dropped
00:49	cilkay	Presumably, it would be kernel<something>
00:49	cilkay	Nothing resembling xen in there.
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01:17	cilkay	Built kernel from pristine sources - same thing - it attempts to boot from NFS.
01:19	caker	cilkay: my guess is that it isn't loading the correct drivers for your hardware
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02:55	soffi	g'day y'all
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04:20	mael	lo soffi
04:20	mael	knewt: are you around?
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06:25	soffi	mael: I changed the /~xen homepage :P
06:27	mael	soffi: yeah!
06:27	mael	it's sexy now :)
06:27	soffi	hehe
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06:29	mael	bad weather in Iceland last week-end?
06:30	mael	soffi: do you need to turn the images into tarballs?
06:30	mael	I can do it for you if you need
06:30	soffi	yup
06:30	soffi	and yup
06:30	mael	k then :)
06:30	soffi	how do you do it ?
06:31	soffi	tar -cpf ?
06:31	mael	I dunno yet :)
06:31	mael	tar cvzf <tarballname> <mounting_point> I guess :)
06:32	soffi	heh
06:32	soffi	thanks :)
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09:13	xai	soffi: im here now.
09:14	xai	soffi: I don't use Ubuntu, but I do have a very stripped down version of Debian.
09:22	xai	I think its about 20MB in size..
09:23	demon	for a stripped down debian?
09:23	demon	I'm guessing that's with info pages, man pages, /usr/share/doc, etc. excised?
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09:24	mael	demon: yeah
09:24	mael	a sarge base install for i386 is approx? 30 MB
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09:35	xai	Yea.. its not totally stripped.
09:36	xai	Of course you can always use debootstrap
09:38	xai	That is in .tgz format, and no, it does have some man pages..
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09:45	xai	Anyone remember how to upload to soffi?
09:46	soffi	yes I do
09:49	---	Channel: services.oftc.net changed the topic of #xen to: Xen Homepage-> http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html \|\| Xen Wiki -> http://wiki.xensource.com \|\| vm-tools : http://www.cs.utexas.edu/users/aliguori/vm-tools/
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10:11	xai	demon: you are right: no docs in my sarge baremetal.
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10:20	xai	You can remove another 3Mb from the archive by removing /var/lib/apt/list/htt* files.
10:20	xai	or 13MB from uncompressed image.. apt-get update just re-populates it.
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10:21	mael	lo knewt_
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10:28	mael	MarkWilliamson, knewt : is your CoW work planned for xen 3.0 or later?
10:28	knewt	my CoW work is independant of xen itself
10:29	xai	mael: sarge base install as i have it is about 69MB including some apt caches. 54 if you delete those.
10:29	xai	When in .tbz format its about 17MB stripped.
10:29	MarkWilliamso	\| mael: basic XenFS may be in beta by 3.0, CoW under XenFS will definitely be post-3.0.
10:29	mael	xai: without the cache my tgz images are 30 MB only (the ones on soffi's webserver)
10:30	demon	so what is xenfs all about?
10:30	mael	knewt: you're using devicemapper, right?
10:30	knewt	mael: yep
10:30	MarkWilliamso	\| demon: from the user's PoV it's much like NFS
10:31	MarkWilliamso	\| but it uses a shared memory transport directly rather than going over the virtual network
10:31	demon	ah...
10:31	mael	if I understand correctly, you copy modified blocks from a Read Only FS?
10:31	xai	mael: is yours a stable version?
10:32	MarkWilliamso	\| demon: also, it has a unified machine-wide buffer cache
10:32	mael	xai: no its a sarge
10:32	MarkWilliamso	\| so blocks can be directly accessed (safely) from the server buffer cache and shared in-place. saves on IO and on physical memory.
10:33	demon	I see... what's the benefit over using xen blkdevs and a traditional linux FS?
10:33	xai	mael: i don't see any sarge listed there right now..
10:33	demon	management simplicity?
10:33	mael	xai: mmh yeah its the xenzoo stuff :))
10:33	MarkWilliamso	\| demon: yup. coherent sharing between domains
10:34	MarkWilliamso	\| but the shared buffer cache stuff is something you don't get with the xen blkdevs - might even perform better for some workloads
10:34	xai	mael: ok.. sorry to duplicate your work.
10:34	mael	xai: no problem, actually a stripped version can be useful
10:35	mael	knewt: do you have to assign blocks to your CoW volumes?
10:35	MarkWilliamso	\| eventually, it'd be nice to support interdomain buffer cache for blk level sharing too.
10:38	xai	soffi: has anyone tried the centos version yet?
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10:47	knewt	mael: yes. a CoW volume needs to be at least the same size as the backing volume. a few K larger if you want to store the metadata in the same device as the CoW data
10:49	mael	humm I'm not sure to understand
10:49	mael	if you estimate only 10% of the read only disk to be modified, a tenth of the read only disk would be enough, no?
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11:04	xai	I just uploaded my bare-metal woody version: 11MB in .tbz format.
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12:27	knewt	mael: if you're using loopback volumes you could of course use sparse files as the CoW areas, but for simplicity and speed the mapper requires a contigous block device the size of the backing volume
12:29	knewt	ever so slightly larger if you include the metadata in the same device as the CoW data instead of storing it seperately
12:32	knewt	if someone were to write a "sparse" device-mapper target then you could even do sparse stuff direct to block devices
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17:02	cartel	hey all
17:03	cartel	im about to try installing on x86_64 :) where do i get a tarball or whatever supporting it?
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17:05	jeroney	cartel: x86_64 is still very unstable
17:06	jeroney	cartel: also does not support domains yet
17:06	jeroney	cartel: all you need to do is compile on x86_64 machine from xen-unstable source
17:08	rharper	cartel: http://www.cl.cam.ac.uk/Research/SRG/netos/xen/downloads/xen-unstable-src.tgz
17:16	cartel	cool
17:16	cartel	thx
17:16	cartel	jeroney: the point in trying is so i can test and provide feedback... does not support domains??????
17:17	cartel	if it doesnt support domains whats the point in trying it? lol
17:18	jeroney	cartel: getting domains up and going is what I'm working on now
17:18	jeroney	cartel: wanted to tell you that so you wouldn't have the wrong expectations
17:19	jeroney	cartel: when x86-64 is fully up and going you will see mails on the mailing list
17:19	cartel	wait... doesnt support 64 bit domains but supports 32 bit domains yes?
17:19	jeroney	no
17:19	jeroney	cartel: initalially it will only support 64bit domains
17:19	jeroney	cartel: 32bit domain support is on the list but not coming soon
17:20	cartel	so im better off just running in 32bit mode
17:20	jeroney	cartel: for now yes
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17:21	cartel	damn and i spent yesterday configuring debian-amd64
17:21	cartel	hehe
17:22	cartel	so are all the celebrities here? wheres ian?
17:22		* cartel thinks he was preemptive asking work to order a amd64 for xen testing
17:24	knewt	Mark often pops in. was in late afternoon today, and going by past experiences might pop in again later tonight
17:25	cartel	simon ever here?
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18:44	aliguori	wow, dom0 apic.. sweet, has anyone tried yet?
18:44	aliguori	i'm compiling right now...
18:45	aliguori	s/apic/acpi/
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18:51	homebaum	aliguori: I thought it was going to be IOAPIC and ACPI. Did they both show up?
18:58	knewt	[[ Move PCI device scanning to dom0. Enable ACPI in dom0. This should greatly reduce the complexity of xen and move the complexity of dealing with hardware bugs and workarounds etc to dom0.
18:58	knewt	The ioapic local apic (and hence all the vectors) are owned by the hypervisor. Dom0 enables the ACPI interpreter, handles PCI and ACPI based interrupt routing. ]]
18:59	homebaum	knewt: thanks
19:00	knewt	[[ Functionality not yet provided: o) acpi=off to support machines with broken or no acpi support. o) support for driver domains ]]
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19:09	aliguori	homebaum: yeah, i mistyped
19:09	aliguori	acronyms are just too close to each other :-0
19:10	homebaum	aliguori: well it was, I thought, suppose to be a little of both ACPI and APIC
19:10	homebaum	But apparently no IOAPIC.
19:10	aliguori	homebaum: i'm just hoping that my thinkpad will stop freezing now
19:10	homebaum	Good luck there
19:11	homebaum	My thinkpad, finally, installed ok and seemed to work.
19:11	knewt	i'm finally going to be able to sensibly try out xen on my laptop :)
19:11	aliguori	homebaum: with xen-unstable? my laptop dies whenever the monitor shuts off
19:11	homebaum	I've got to chase down why X is not happy with Xen on my old home box - gripes about the agpart. I thought there was a work-around for this
19:12	aliguori	disabling it in the bios doesn't seem to help
19:12	homebaum	I left xen running on my laptop over the weekend. Monitor was shutoff several times, but came back no problem
19:12	aliguori	hmmmm
19:13	homebaum	Couldn't get a clean shutdown today, though, when I was heading into the office
19:13	aliguori	you have a t41 right?
19:13	homebaum	Mine is a T40
19:13	aliguori	ahhh
19:14	cilkay	Hi. After several kernel builds, I don't seem to be any closer to getting Xen going. I suspect it has to do with support for the RAID controller on the server. lspci reports that the RAID bus controller is AMI MegaRAID, Rev. 20. When I run make menuconfig, the only MegaRAID I see is LSI Logic, legacy. The new LSI Logis is also MegaRAID. Should I select one of those?
19:15	cilkay	aliguori, homebaum I run Mandrake 10.1, without Xen, on my TP A21p, no problems.
19:15	aliguori	cilkay: i'd use whatever you normally use
19:16	cilkay	aliguori, lsmod reports megaraid
19:16	cilkay	I didn't have to build a custom kernel for that machine - Mandrake auto detected all the hardware.
19:17	aliguori	you'll have to dive into the configs and see..
19:18	aliguori	cilkay, if you build both as modules, you should be ok
19:18	cilkay	Presumably, I'd need an initrd to make that work.
19:19	aliguori	i don't see why
19:19	aliguori	if you're already using an initrd then perhaps
19:19	cilkay	How would the kernel know that it is supposed to use a module to be able to see the root otherwise?
19:20	cilkay	... unless the module is compiled in the kernel?
19:20	aliguori	yup
19:25	knewt	cilkay: "LSI Logic Legacy MegaRAID Driver" aka MEGARAID_LEGACY is the module "megaraid"
19:27	cilkay	knewt, thanks. I've started the make. Will see how it goes.
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19:29	aliguori	does anyone know if this is a gcc-ism?
19:29	aliguori	return read_config_nybble(router, 0x5C, (pirq-1)1);
19:29	aliguori	pirq is an int
19:30	aliguori	arch/xen/i386/pci/irq.c:274
19:32	aliguori	it's in the patch
19:32	yosh	in a vanilla kernel that reads (pirq-1)^1
19:34	aliguori	wow!
19:35	aliguori	that was munged by thunderbird
19:35	aliguori	it changed it to (pirq-1) raised to the 1 power
19:35	yosh	hah
19:35	aliguori	and the copy-paste copied it as (pirq-1)1
19:35	aliguori	that's insane.
19:35	aliguori	yosh: thanks for the pointer btw
19:35	yosh	np
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19:55	knewt	ok, having coded a couple of features today that i was originally intending to do later, instead of what i /was/ intending to code today, i think it's time to call it quits on dm-cow until tomorrow
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22:43	cilkay	I'm still struggling with building a kernel. I used make menuconfig and selected the QLA1280 module to be compiled into the kernel. When I do make install, I get: No module qla1280 found for kernel 2.6.10-xen0 and it aborts. Any suggestions?
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22:48	cilkay	I'm getting ready to throw in the towel on getting Xen going on Mandrake 10.2 as dom0. Does it really make much difference which OS dom0 is based on?
22:49	cilkay	As far as I can tell, dom0 is only used to host other virtual machines, which can run various unmodified Linux distros or *BSD.
22:51	cilkay	If that is really the case, dom0 could be NetBSD, which I don't know much about but it apparently has the Xen patch incorporated in the kernel.
22:51	cilkay	Would using NetBSD for dom0 and MDK for dom1 be feasible.
22:51	cilkay	?
22:51	caker	cilkay: it shouldn't make much difference which OS dom0 is, no
22:52	caker	cilkay: you're doing all your "make"s with ARCH=xen, right?
22:52	cilkay	Presumably, you run OpenSSH on dom0 so you can start/stop other domains, right?
22:53	cilkay	caker, I did: make menuconfig, make, make install - that's it.
22:53	caker	cilkay: you need to run make menuconfig ARCH=xen, make ARCH=xen, etc..
22:53	caker	or, export ARCH=xen
22:54	cilkay	k
22:54	cilkay	would that account for the missing qla1280 module?
22:54	caker	possibly
22:54	cilkay	OK, will try that now. Thanks.
22:58	demon	well, the kernel you use as dom0 has to (a) know how to talk to the hardware, and (b) know how to provide frontend virtual NIC and block device services for other domains
22:58	demon	afaik, netbsd can't yet be dom0 with xen 2
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23:22	cilkay	Built and installed a kernel with ARCH=xen - it still does not boot, though with a different problem this time. It starts loading the kernel but then reboots automatically. I have no idea what it actually outputs to the console as it doesn't stay long enough for me to read it.
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23:26	demon	well, as others have mentioned, you can append the 'noreboot' option to the xen hyperkernel's command line
23:26	demon	that'll keep it from rebooting the machine, so you can see what it spits out
23:27	demon	did you 'mkbuildtree' from the sparse tree in the xen source first, then do 'make ARCH=xen menuconfig', configure the kernel, and build it?
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23:51	cilkay	demon, no, I had not done the mkbuildtree. I didn't see that anywhere in the docs.
23:52	cilkay	However, I just tried installing from the binary package.
23:52	cilkay	Quite accidentally, I set the 2.4.29 kernel to be the default boot.
23:52	cilkay	It booted, though it could not find modules.config
23:53	cilkay	So, I tried setting the 2.6.9 as the default, rebooted, it didn't boot - looked for an NFS server, which doesn't exist here.
23:53	cilkay	I'll try the mkbuildtree.
23:53	cilkay	... first
---	Log	closed Tue May 03 00:00:43 2005