TheGrebs.com:IRC Logs:#xen:2006:03:05

---	Log	opened Sun Mar 05 00:00:58 2006
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01:36	<tessier>	Hello all!
01:36	<tessier>	Does anyone actually have a VT-x box that they are running Windows under xen on?
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14:08	<jochen>	hello?
14:09	<jochen>	sorry, this is my first IRC session. I'd like to ask a question about xen, if somebody is here?
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14:25	<jochen>	I built xen and the latest kernel from the Mercurial repositories (I need pciback.hide). When xen starts, it loads the dom0 kernel, recognizes an ELF_XEN-something, but the kernel doesn't start and system reboots immediately. Where do I have to start to look?
14:28	<ivan>	jochen: try noreboot on xen kernel line
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14:30	<jochen>	I did. The system just stops after "Scrubbing memory...". No kernel starts.
14:33	<jochen>	The kernel image couldn't be too wrong: If I misspelled the filename, grub already complaints. And xen tells me that he has identified a dom0 kernel.
14:37	[~]	ivan shurgs
14:39	<jochen>	but the latest mercurial kernel (2.6.16-rc5) should work with any xen 3.0 hypervisor, when I choose "Subarchitecture (Xen-compatible)" and "Privileged Guest (Domain 0)"?
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14:42	<ivan>	hmmm, im not sure it does
14:42	<ivan>	but i only vaguely maybe remember someone possibly saying that
14:44	<jochen>	ok, what I did: pull the "xen-3.0-testing.hg" repository, "make clean tools xen install-tools install-xen", then pull the "linux-2.6-xen.hg" kernel repository, configure it and install it.
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17:46	<teferi>	incidentally, how many VMs do you think my athlon64 x2 3800+ (2.0GHz dual-core) can support?
17:46	<teferi>	assume I can add as much RAM as I need and that I have enough disk
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18:16	<hikenboot>	when issuing sudo hdparm -d1 -c1 -u1 /dev/hda on my NF7-S2G Abit computer I get HDIO_SET_DMA failed: Operation not permitted
18:16	<hikenboot>	any ideas
18:16	<hikenboot>	its in my xen kernel
18:16	<hikenboot>	it doesnt seem to want to allow me to enable DMA on my hard drive
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18:19	<hikenboot>	I have enabled everything i can find in the kernel to do with nvidia chipset including a dma related setting
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18:37	<aliguori>	teferi, it really depends on how much work each vm is doing
18:37	<teferi>	aliguori: yeah, i know, but back-of-the-envelope estimate?
18:38	<teferi>	none of them are doing scientific computing or anything like that
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18:40	<aliguori>	teferi, 2 per core is a common estimation...
18:40	<teferi>	aliguori: hm. well, i'm already over that limit, then :P
18:40	<aliguori>	although i don't know how powerful the cores are in x86 systems
18:40	<teferi>	these are 2GHz Athlon64s.
18:40	<aliguori>	teferi, yeah, as I said, it really depends on the workload.. i've heard as high as 10 per cpu (single core) in production
18:41	<teferi>	I've been assuming 4 per core because that made the numbers nice
18:41	<teferi>	heh
18:41	<teferi>	and also seemed reasonable
18:41	<teferi>	We got two UMLs plus one heavily loaded host machine on our old single-core Athlon XP 1600+ (1.4GHz).
18:41	<teferi>	So higher numbers for Xen, which is faster, seemed reasonable
18:41	<aliguori>	yup
18:42	<teferi>	(and we could have gotten more)
18:43	<teferi>	incidentally, I am absolutely loving the way Xen does networking
18:43	<aliguori>	wow, i don't hear that frequently :-)
18:43	<teferi>	aliguori: coming from UML, it's a breath of fresh air
18:43	<aliguori>	compared to uml? what does uml do by default?
18:43	<teferi>	aliguori: you have to do horrible hackery with the tun and tap drivers
18:44	<teferi>	xen just gives you virtual ethernet ports connected by virtual cables. beautiful.
18:44	<aliguori>	ahhh
18:45	<teferi>	believe me, it's an improvement
18:45	<aliguori>	there's something be said for the fact that in a lot of circumstances, the xen networking scripts just work..
18:45	<teferi>	quite
18:45	<teferi>	getting bridging working was a snap
18:45	<aliguori>	it's cause there's a bunch of hackery going on in the background :-)
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18:46	<teferi>	even adding another bridge for a private network was a sanp
18:46	<teferi>	...snap
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18:51	<teferi>	well, thank you so very much for hiding the hackery
18:51	<teferi>	and, more importantly, for making it work :)
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19:43	<hikenboot>	anyone around that compiles there own xen kernel in ubuntu?
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---	Log	closed Mon Mar 06 00:00:50 2006