TheGrebs.com:IRC Logs:#uml:2005:04:12

---	Log	opened Tue Apr 12 00:00:16 2005
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09:31	itamarjp	hi
09:35	itamarjp	helooo.....
09:39	itamarjp	Are you boot�s.....
09:39	itamarjp	?
09:40	AquaJo	yes
09:41	itamarjp	Aquajo, Can you help-me ?
09:44	AquaJo	perhaps
09:44	itamarjp	Always do synchronous disk IO for UBD
09:44	itamarjp	What�s the best for a uml provider ? this options on or off ?
09:45	AquaJo	on is more secure (but slower)
09:46	itamarjp	I need to put my guest machines running fast....
09:46	itamarjp	What�s the problems with this option off ?
09:47	itamarjp	it�s possible to crash root_fs ?
09:47	itamarjp	I am sorry for my bad english.
09:48	AquaJo	if the host fails, yes
09:49	itamarjp	for sample
09:49	itamarjp	I I kill a guest machine
09:49	itamarjp	ps -u guest_machine
09:49	itamarjp	kill -9 gues_machine
09:50	itamarjp	if I kill a guest machine will cause problem ?
09:51	itamarjp	I am using ext3 on guest machine.
09:51	AquaJo	it might if the caches wern't emtied corectly
09:52	itamarjp	if the host fail it�s possible to fix root_fs with fsck ?
09:53	AquaJo	ist should, but must not
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09:57	itamarjp	I need to go.
09:57	itamarjp	I will go back later....
09:57	itamarjp	Aquajo thanks for you help
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10:37	itamarjp	hi
10:54	zigge1	anyone have any good tips for getting UML to run faster? Already using SKAS, swap, and have UBD sync disk I/O turned off...
10:56	Newsome	zigge1: is TMPDIR a tmpfs filesystem?
10:59	zigge1	I don't think so. how can I check that?
11:01	Newsome	zigge1: a couple questions down - http://uml.harlowhill.com/index.php/Troubleshooting#probsrunning
11:01	Newsome	zigge1: "Q: Why is the UML guest so much slower than the host? It runs fine for a little while, then hangs for long periods of time. There also seems to be a lot more disk access than there should be."
11:02	zigge1	I'll check it out. thx
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11:06	itamarjp	thanks
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11:07	zigge1	this tmpfs stuff is interesting. Do I have to specify /tmp as a hostfs mount like any other random directory I want to share between guest&host, or is this one automatically shared?
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11:08	Newsome	zigge1: The UML binary will open a file in the TMPDIR, then mmap it.
11:08	Newsome	zigge1: It's not mounted in the UML
11:08	zigge1	gotcha
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11:09	Newsome	It's just how UML grabs a chunk of memory
11:10	Newsome	Only, if it's not tmpfs, it won't be memory :)
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11:31	itamarjp	.
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12:55	zigge1	I think I'm still having performance issues. Does this output from time look right?
12:55	zigge1	real 20m3.777s
12:55	zigge1	user 3m19.310s
12:55	zigge1	sys 2m46.360s
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13:01	zigge1	I edited fstab on the host and added: tmpfs /tmp tmpfs defaults,size=1024M 0 0. Didn't seem to make a bit of difference, if anything it made uml run a little slower, so I'm guessing this whole tempfs thing still isn't set up quite right. Any ideas?
13:02	Newsome	While the UML is running, does "df" show space being taken in /tmp?
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13:03	zigge1	it doesn't
13:07	zigge1	hmm...my host doesn't have an env. var TMPDIR set. is that where uml looks, or does it simply default to /tmp?
13:07	Newsome	make sure /tmp is mounted, then "export TMPDIR=/tmp" before starting the UML
13:07	Newsome	It should default to /tmp
13:10	zigge1	did both of those things, still doesn't show up on df. will it not show up until I use it, or is it still not working properly?
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13:20	Newsome	/tmp should show up as a mounted filesystem. Here's mine (mounted in /UML/VM instead of /tmp): none 300M 0 300M 0% /UML/VM
13:20	Newsome	it won't show up with anything in use until the UML is running
13:22	zigge1	ahh, my mistake. I thought you meant it should show it in on df inside UML. it shows up on the host.
13:23	zigge1	"show it in on" should probably be something more like "show up in/on" :)
13:25	zigge1	weird. so I guess it looks like that's working (part of it is being used) and I'm pretty sure my UML swap is working too. still getting a pretty big difference between usr+sys and real when I time something though. Something shouldn't take 3.5 times as long to run inside UML as it does on the host, right?
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13:27	Newsome	context switches are expensive, and UML requires quite a few
13:27	zigge1	is this normal? When I run df on the host tmpfs is listed twice. once as /tmp (where part of it is being used) and once as /dev/shm, where 0% of it is being used.
13:29	Newsome	several distros do mount a tmpfs in /dev/shm. FC, for example
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13:30	zigge1	right. I'm running debian as both host and guest. /dev/shm doesn't show up on my host's fstab, so its probably something that came with my debian root_fs
13:31	Newsome	Running something inside the UML shouldn't affect the host
13:38	zigge1	I guess that's a good point :) Wouldn't really want your UML mounting whatever it pleased on the host. Oh well. I guess setting up a tmpfs mount on the host didn't help me out as much as I was hoping. thanks for your time Newsome.
13:40	Newsome	good luck
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13:41	Newsome	zigge1: are you using hostfs for / ? And are you running a recent 2.6.x kernel?
13:42	Newsome	(hostfs is pretty slow...use a file if possible)
13:43	zigge1	using COW files for /. using 2.6.11.5 linux kernel
13:44	Newsome	okay, just making sure
13:44	zigge1	like you said, it's probably context switching that's biting me. It compiles decently fast, but then when I run it through a number of small test programs it crawls
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14:06	itamarjp	hi
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15:53	jbailey	Hi! I'm preparing a glibc update for Breezy (the next Ubuntu release), and have been looking at dropping LinuxThreads support and going NPTL-only on Powerpc. Someone mentioned that UML might still have problems on this, but google claims that there's no mention of "nptl" on user-mode-linux.sf.net
15:54	AquaJo	If I'm up2date: uml doens't support NTPL at the moment
15:55	Newsome	TLS is not supported
15:55	Newsome	threads themselves aren't a problem
15:55	jbailey	Ugh. Do you know what the plans are around this? I see the RHEL5 is dropping NPTL support next year. I know we need to keep it for ia32, but I'm really hoping to do the switch on powerpc sooner.
15:55	jbailey	err.
15:55	jbailey	dropping LinuxThreads.
15:56	jbailey	So requiring TLS accesses for all threads, errno, etc.
15:56	Newsome	for now, it usually just works to do "mv /lib/tls /lib/tls.broken" or somesuch to disable just TLS
15:57	Newsome	usually just causes the system to fall back to non-tls libraries
15:57	jbailey	Right, except that I'm proposing that Breezy might only come with a TLS glibc library for Powerpc.
15:57	jbailey	We already do this for amd64.
15:59	Newsome	I'm not quite sure about UML on Power
16:00	jbailey	That would solve my issue nicely, too. =)
16:00		* jbailey googles for that.
16:01	jbailey	Looks like it's 64 bit only and was done in January.
16:01	jbailey	Solves that problem nicely for me. Since it's never worked before for Ubuntu, I don't mind "breaking" it.
16:02	jbailey	err.
16:02	jbailey	for Poewrpc, I mean.
16:02	jbailey	Thanks all. =)
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16:09	mcr	I'm seeing kernel printk() show up with a repeating sequence. I can not trace this to my code. I think it is UML console output issues...
16:09	mcr	<6>klips_debug:pfkey_list_remove_socket: removing sock=0pa03a8300<6>klips_debug:pfkey_list_remove_socket: removing sock=0pa03a83006>klips_debug:pfkey_list_remove_socket: removing sock=0pa03a8300>klips_debug:pfkey_list_remove_socket: removin
16:09	mcr	notice how it just repeats the buffer over and over...
16:11	Newsome	mcr: Looks like the message is being thrown faster than the kernel message buffer can catch it
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16:16	mcr	could be.
16:16	mcr	only happens on UML.
16:16	mcr	doesn't happen consistently.
16:16	mcr	I run klogd in my test cases to capture the kernel messages... do you think I should expand some buffer?
16:17	Newsome	Is it dumping that to the console?
16:17	mcr	well, I run klogd, so that it doesn't go to the console.
16:17	mcr	klogd >/tmp/file
16:18	mcr	at the end of the test, I kill klogd, and cat /tmp/file
16:19	Newsome	hmm, there are a couple patches that might be related. Not quite sure, though.
16:19	Newsome	http://user-mode-linux.sourceforge.net/work/current/2.6/2.6.11-bk8/patches/console-locking
16:20	Newsome	just looking through jdike's list - http://user-mode-linux.sourceforge.net/patches.html
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16:46	Shaun	Newsome: is that console-locking patch to fix the problem where on 2.6 when i log out of a uml's console it locks up?
16:46	Shaun	so far i've only experienced the problem with centos 4
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16:47	mcr	Newsome, thanks, that was useful. I didn't know about Jeff's list.
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16:57	Newsome	Shaun: sorry, I'm not sure. You might have to check that one through with Jeff
16:59	Newsome	Hopefully, Linus can get a source control system in place soon, so that we can all start pushing patches back up.
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19:47	caker	http://user-mode-linux.sourceforge.net/diary.html <-- wild.
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20:12	itamarjp	giiiiiiiiiiiiiiiiiiiiii
20:13	itamarjp	hiiiiiiiiiiiii
20:13	itamarjp	hellooo
20:16	itamarjp	uml guest cpu usage limit ?
20:16	itamarjp	it�s possible ?
20:26	mcr	yes.
20:26	mcr	use "limit" (aka "ulimit") before you start the UML.
20:28	HIghoS	caker: Wow :D
20:28	HIghoS	caker: That's crazy! gg jeff.
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20:37	caker	itamarjp: why do you keep pming me?
20:38	caker	mcr: won't setting a limit just kill the process?
20:38		* caker re-reads man ulimit
20:39	caker	-t The maximum amount of cpu time in seconds
20:39	caker	it gets killed after that limit is reached, not very useful for UML
20:40	itamarjp	Hi caker
20:40	itamarjp	a moment pleas
20:40	itamarjp	a moment please
20:41	caker	itamarjp: what do you want? :)
20:41	itamarjp	I need your help.
20:41	itamarjp	Can you help-me with uml ?
20:41	caker	itamarjp: no, but these kind folks likely will
20:44	itamarjp	I need to increasy speed of my guest�s machines.
20:46	mcr	caker, uh, yeah, sorry you are right. you want to use nice. there may be other tools that are linux specific, that I know less about.
20:46	mcr	itamarjp, if you want to increase the speed, then that's a different problem.
20:46	mcr	if you wanted to limit how much the guests could do, that's easier.
20:48	itamarjp	Can you help-me mcr ?
20:48	mcr	your guests are probably running as fast as they can.
20:49	mcr	I assume that you are using skas, you have provided your guests with enough ram, they have decent swap (which might mean SCSI).
20:49	mcr	if you have IDE, that you have only one target per bus.
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20:52	itamarjp	Yes, I am using skas
20:53	itamarjp	I am using a ide disk.
20:55	itamarjp	sysemu is good ?
20:55	itamarjp	anyone using sysemu /
20:55	itamarjp	?
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23:08	itamarjp	resize2fs: File too large while trying to determine filesystem size
23:09	itamarjp	resize2fs -p root_fs.ext3
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23:12	itamarjp	helooooooooooooo
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23:55	itamarjp	'[root@router conacci]# e2fsck -f root_fs.ext3 -y
23:55	itamarjp	e2fsck 1.36 (05-Feb-2005)
23:55	itamarjp	Pass 1: Checking inodes, blocks, and sizes
23:55	itamarjp	Pass 2: Checking directory structure
23:55	itamarjp	Pass 3: Checking directory connectivity
23:55	itamarjp	Pass 4: Checking reference counts
23:55	itamarjp	Pass 5: Checking group summary information
23:55	itamarjp	root_fs.ext3: 53583/128000 files (0.2% non-contiguous), 140324/256000 blocks
23:55	itamarjp	[root@router conacci]# dd if=/dev/zero of=root_fs.ext3 bs=1 count=1 seek=40G conv=notrunc
23:55	itamarjp	1+0 records in
23:55	itamarjp	1+0 records out
23:55	itamarjp	[root@router conacci]# resize2fs -p root_fs.ext3
23:55	itamarjp	resize2fs 1.36 (05-Feb-2005)
23:55	itamarjp	resize2fs: File too large while trying to determine filesystem size
23:55	itamarjp	[root@router conacci]#
23:55	itamarjp	[root@router conacci]#
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---	Log	closed Wed Apr 13 00:00:47 2005