Re: amanda vs 2.6
From: Gene Heskett (gene.heskett_at_verizon.net)
Date: 11/27/03
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To: Nick Piggin <piggin@cyberone.com.au>, Linus Torvalds <torvalds@osdl.org> Date: Thu, 27 Nov 2003 05:05:50 -0500
On Thursday 27 November 2003 03:41, Nick Piggin wrote:
>Linus Torvalds wrote:
>>On Wed, 26 Nov 2003, William Lee Irwin III wrote:
>>>On Wed, Nov 26, 2003 at 02:43:43PM -0500, Gene Heskett wrote:
>>>>No, it just hangs forever on the su command, never coming back.
>>>>everything else I tried, which wasn't much, seemed to keep on
>>>> working as I sent that message with that hung su process in
>>>> another shell on another window. I'm an idiot, normally running
>>>> as root... I've rebooted, not knowing if an echo 0 to that
>>>> variable would fix it or not, I see after the reboot the default
>>>> value is 0 now.
>>>
>>>Okay, then we need to figure out what the hung process was doing.
>>>Can you find its pid and check /proc/$PID/wchan?
>>
>>I've seen this before, and I'll bet you 5c (yeah, I'm cheap) that
>> it's trying to log to syslogd.
>>
>>And syslogd is stopped for some reason - either a bug, a mistaken
>> SIGSTOP, or simply because the console has been stopped with a
>> simple ^S.
>>
>>That won't stop "su" working immediately - programs can still log
>> to syslogd until the logging socket buffer fills up. Which can be
>> _damn_ frsutrating to find (I haven't seen this behaviour lately,
>> but I remember being perplexed like hell a long time ago).
>
>Same problem here. Been seeing them now and again for quite a while
>I have syslogd and klogd sleeping in do_syslog. cron and login are
>sleeping in schedule_timeout. A sysrq+T gets things going again but
>unfortunately the interesting state probably wasn't captured. I have
>the /proc/*/wchan and sysrq+t trace if anyone is interested.
>
>I'll try any suggestions of what I should look at when I hit it
> again.
User experience report Nick.
Around midnight last night, haveing left
/proc/sys/vm/overcommit_memory=1, I tried to build 2.6.0-test11.
The machine got plumb spastic, taking nearly 10 minutes to unpack the
tarball and copy the configs etc, and another 5 just to run the last
command in my script, 'make xconfig'. Thats my buildit26 script,
which normally runs in maybe 2 minutes plus whatever browsing time I
waste in that xconfig. I'm talking mouse locked up for several
seconds at a time. Using the anticipatory scheduler.
cd'ing into linux-2.6, and editing 1 character in my makeit script
took another 2 minutes, then running the script, about a 12 minute
job as it oversees the fully installed kernel, took about 17 minutes.
With it running, it was quite sluggish vim'ing /boot/grub/grub.conf to
add the new kernel and save it.
I got rebooted with about 2 minutes to spare before amanda was due to
run. The machine is now normal again since the reboot set that back
to 0. I've tried to set it back to zero by hand, but once the
machine turns into an arthritic dog because its set to 1, then a
reboot seems to be the only recovery.
To me, setting this "overcommit_memory" bit to non-zero seems to
trigger something other than what it was designed to do.
The kde utils kpm and ksysguard also do not show enough cpu usage in
the process list, with the sum totals of both usage columns often
being below 25%. The graphical displays however seem to be ok. Both
of those were of course built while running a 2.4 kernel so I'd
expect to see some miss-match when they are interrogating a 2.6
kernel.
My $0.02, but performance like that would scare a new user right back
to winderz.
Around here, its thanksgiving day, and we traditionally eat way too
much turkey (or something like that :) And then complain about the
weight we've gained of course...
-- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.27% setiathome rank, not too shabby for a WV hillbilly Yahoo.com attornies please note, additions to this message by Gene Heskett are: Copyright 2003 by Maurice Eugene Heskett, all rights reserved. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- Previous message: Jörn Engel: "Re: OT: why no file copy() libc/syscall ??"
- In reply to: Nick Piggin: "Re: amanda vs 2.6"
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