TheGrebs.com:IRC Logs:#xen:2006:02:19

---	Log	opened Sun Feb 19 00:00:52 2006
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03:50	<vicmar>	hello, I have a noob question, one OS in dom1 (eg. windows xp using vanderpool) will have FULL access to the video card? (and then the possibility to play 3D games without performance loss)
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13:52	<iamlost>	how do i debug a domU kernel?
13:52	<iamlost>	i thought about using kgdb but the kernel wont compile with the required patches..
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16:38	<hensema>	hi guys
16:39	<hensema>	quick faq before I go to bed: where does the disk cache live in xen: in dom0, domU or both?
16:39	<hensema>	(so, when domU reads from disk, is the data cached in two places or one?)
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16:43	<iamlost>	heh
16:43	<iamlost>	rusty russell
16:44	<riel>	hensema: if your guest is LVM or partition backed, the data is only cached in domU
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16:44	<riel>	hensema: if your guest is backed by a loop device, it is also cached (and copied) in dom0
16:44	<iamlost>	anyways, i've done a bit more of research..
16:44	<rusty>	iamlost: Yes.
16:44	<iamlost>	about domu_debug
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16:46	<iamlost>	so basically, the gdbstub for domu_debug supports intercepting breakpoints, but can not set them itself for whatever reason...
16:46	<iamlost>	so how do i set the breakpoints manually?
16:47	<iamlost>	i know i have to stick an int3 somwhere...
16:52	[~]	iamlost is thinking about just giving up and using kdb.
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17:15	<aliguori>	hm, xen's on slashdot
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17:32	<rusty>	aliguori: NetBSD xen interview. V. strange choice.
17:33	<aliguori>	rusty, yeah, especially since 3.0 didn't get a story :-) must be a slow news day
17:34	<muli>	hi rusty, aliguori
17:34	<aliguori>	rusty, so i've been thinking about the performance numbers you mentioned earlier. i assume this was 1 domU right? i wonder if xen would do better with multiple domUs. i think 1 dom0/domU is worse case scenario for the scheduler (lots of trashing back and forth between the two)
17:34	<aliguori>	muli, howdy
17:35	<rusty>	muli: gug!
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17:40	<muli>	holy jumping chariots, it booted!
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17:48	<rusty>	aliguori: I don't understand why mine wouldn't suffer from same problems. My block device is as dumb as possible: one request outstanding at a time.
17:50	<rusty>	aliguori: I'm changing it to use direct-io, to avoid the DOM0 buffer cache (where the single-request thing should start to hurt me).
17:50	<tonfa>	rusty: do you want to get rid of xenstore for drivers ?
17:50	<rusty>	tonfa: Yes, that too.
17:52	<aliguori>	rusty, so no more sendfile? i thought that was pretty cool :-)
17:53	<rusty>	aliguori: I don't do sendfile at the moment, either: that was a future optimization. But I'm trying to figure out why their stuff is so slow.
17:56	<rusty>	aliguori: I'm not going to waste time optimizing my code. I want to get it feature-complete.
18:10	<iamlost>	out of curiosity
18:10	<iamlost>	what is the 'official' way to use filebacked VBDs that contain partition tables?
18:11	<iamlost>	i managed to get it to work by hacking /etc/xen/scripts/block to add a new type 'file-oNNNN' where NNNN was some number that would be used as an offset (passed to losetup via -o)
18:11	<aliguori>	iamlost, just expose it as a partitioned device (i.e. file:/path/to/image.img,hda,w)
18:11	<iamlost>	aliguori: i tried that but it couldnt mount the root for some reason.
18:12	<aliguori>	if you set root = /dev/hda1 and the partition table is valid, it will work
18:13	<iamlost>	hmm
18:13	<iamlost>	i tried that but
18:13	[~]	iamlost decides to give it another go
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---	Log	closed Mon Feb 20 00:00:44 2006