Re: Updated performance results

Steven Pratt
2009-09-16T18:37:08Z

Chris Mason wrote:
> On Wed, Sep 16, 2009 at 01:16:56PM -0500, Steven Pratt wrote:
>
>> Chris Mason wrote:
>>
>>> On Wed, Sep 16, 2009 at 12:57:22PM -0500, Steven Pratt wrote:
>>>
>>>> Steven Pratt wrote:
>>>>
>>>>> Chris Mason wrote:
>>>>>
>>>>>> On Mon, Sep 14, 2009 at 04:41:48PM -0500, Steven Pratt wrote:
>>>>>>
>>>>>>> Only bit of bad news is I did get one error that crashed the system
>>>>>>> on single threaded nocow run. So that data point is missing.
>>>>>>> Output below:
>>>>>>>
>>>>>> I hope I've got this fixed. If you pull from the master branch of
>>>>>> btrfs-unstable there are fixes for async thread races. The single
>>>>>> patch I sent before is included, but not enough.
>>>>>>
>>>>> Glad you said that. Keeps me from sending the email that said the
>>>>> patch didn't help :-)
>>>>>
>>>>> Steve
>>>>>
>>>> Well, still getting oopses even with new code.
>>>>
>>>> Lots of:
>>>> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] BUG: soft lockup -
>>>> CPU#10 stuck for 61s! [btrfs-endio-1:30250]
>>>> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] Pid: 30250, comm:
>>>> btrfs-endio-1 Not tainted 2.6.31-autokern1 #1 IBM x3950-[88726RU]-
>>>> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] RIP:
>>>> 0010:[<ffffffff81153920>] [<ffffffff81153920>] crc32c+0x20/0x26
>>>>
>>> If I'm reading this right, you've got a softlockup in crc32c? Something
>>> has gone really wrong here. Are you reusing datasets from old runs?
>>>
>> From the second machine a single bug:
>> Sep 16 11:53:42 btrfs2 kernel: [ 3769.298240] ------------[ cut here
>>
>
> Ok, which mount options and job file is this from?
>
>
mount -t btrfs /dev/ffsbdev1 /mnt/ffsb1'
[20090916-11:47:37.738883526] PROCESSING COMMAND : 'run
random_writes__threads_0001 ffsb
http://hks.austin.ibm.com/users/corry/btrfs/ffsb/profiles/btrfs2/random_writes.ffsb
num_threads=1'

So , this is single disk machine, running single threaded random write
workload. Buffered, not odirect.

I'm packaging up full messages file, repeated errros makes it big. Will
send separately.

Steve

> -chris
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>