linux-kernel - Re: git pull on linux-next makes my system crawl to its knees and beg for mercy

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Date:	Fri, 18 Dec 2009 13:13:13 -0800
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Bob Copeland <me@...copeland.com>
Subject: Re: git pull on linux-next makes my system crawl to its knees and beg 
	for mercy

On Fri, Dec 18, 2009 at 12:51 PM, Luis R. Rodriguez <mcgrof@...il.com> wrote:
> On Fri, Dec 18, 2009 at 11:55 AM, Luis R. Rodriguez <mcgrof@...il.com> wrote:
>> On Fri, Dec 18, 2009 at 11:19 AM, Luis R. Rodriguez <mcgrof@...il.com> wrote:
>>> On Fri, Dec 18, 2009 at 9:38 AM, Bartlomiej Zolnierkiewicz
>>> <bzolnier@...il.com> wrote:
>>>> On Friday 18 December 2009 06:26:29 pm Luis R. Rodriguez wrote:
>>>>
>>>>> on my kernel logs. Bewildered with this issue I set out to prove to
>>>>> myself this issue was not a 2.6.32 issue and booted other kernels,
>>>>> including Ubuntu's distro kernel on 2.6.31 and then later my own built
>>>>> fresh 2.6.27.41 kernel. The issue was reproducible on all three
>>>>> kernels!
>>>>>
>>>>> This lead me to believe this was a system / hard drive issue and
>>>>> embraced myself for a system fix. I yet needed to prove this was
>>>>
>>>> Just some hints for ruling out the system / hard drive problem.
>>>>
>>>> smartctl -a /dev/sdx is your friend for checking your disk (keep an eye
>>>> on anything suspicious like re-allocated sector count going up etc.)
>>>
>>> Sweet thanks, here's my current output, I'll try later after I get
>>> some day work done to pull linux-next and make it moan. Let me know if
>>> you see anything fishy.
>>
>> <-- snip full log -->
>>
>>> Also available at:
>>>
>>> http://bombadil.infradead.org/~mcgrof/logs/2009/12/smart-ctl-sda2.txt
>>>
>>>> It could be also fs related issue that shows up only under specific
>>>> conditions
>>>
>>> OK -- I see, I used a fresh new ext3, did not make the jump to ext4.
>>>
>>>> (i.e. almost full partition -- some file-systems starts to
>>>> crawl when the amount of available free space gets low).
>>>
>>> Got it, thanks, so partition has a lot of room.
>>>
>>> mcgrof@tux ~ $ df -h
>>> Filesystem            Size  Used Avail Use% Mounted on
>>> /dev/sda2              91G   43G   44G  50% /
>>>
>>> Also ony have one partition.
>>
>> GSmartControl is very cool, just ran the short self test and it passed
>> without issues. I'll now run the extended self tests. I'll not that
>> right after the self test I had to checkout the 2.6.32.y branch on
>> hpa's tree and noticed similar type of slow down as I did with pulling
>> linux-next. Only thing with linux-next is it takes ages complete which
>> just makes waiting unbearable. This all makes me suspect its something
>> else. But lets seee what these results on the GSmartControl yield.
>
> I tested the same exact git pull on the other T61 laptop I have and
> was able to see the same crippling effects but not as bad as with my
> main T61. Different between them is the one where I see the worst
> issue has a Intel(R) Core(TM)2 Duo CPU     T8100  @ 1.80GHz while the
> other one has the same CPU but at 2.10GHz. The only thing I see
> different between linux-next and say wireless-testing is linux-next
> will have a lot more newer objects and the pull will end with a git
> merge that will fail and require you to 'git reset --hard origin'. The
> later part shouldn't be taken into the equation there though as I see
> the issue creeping up early on during the pull, while git is counting
> objects and even later compressing.
>
> I'm starting to glare at CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> with suspicious looks. On both boxes the CPU kept itself @ 800 MHz
> during most of the git pull, I did see the CPU idle hitting 0
> frequently and the CPU wait time ~ 20 or 30.
>
> My GSmartControl extensive test is almost done.

The test completed without any errors.

> I'll test 2.6.33-rc1 once John gets it into his tree.

Now to wait for this guy.

  Luis
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