Re: Linux Software RAID 5 + XFS Multi-Benchmarks / 10 Raptors Again

[Bill Davidsen <davidsen@tmr.com>]

Justin Piszcz wrote:
>
>
> On Thu, 17 Jan 2008, Al Boldi wrote:
>
>> Justin Piszcz wrote:
>>> On Wed, 16 Jan 2008, Al Boldi wrote:
>>>>> Also, can you retest using dd with different block-sizes?
>>>
>>> I can do this, moment..
>>>
>>>
>>> I know about oflag=direct but I choose to use dd with sync and 
>>> measure the
>>> total time it takes.
>>> /usr/bin/time -f %E -o ~/$i=chunk.txt bash -c 'dd if=/dev/zero
>>> of=/r1/bigfile bs=1M count=10240; sync'
>>>
>>> So I was asked on the mailing list to test dd with various chunk sizes,
>>> here is the length of time it took
>>> to write 10 GiB and sync per each chunk size:
>>>
>>> 4=chunk.txt:0:25.46
>>> 8=chunk.txt:0:25.63
>>> 16=chunk.txt:0:25.26
>>> 32=chunk.txt:0:25.08
>>> 64=chunk.txt:0:25.55
>>> 128=chunk.txt:0:25.26
>>> 256=chunk.txt:0:24.72
>>> 512=chunk.txt:0:24.71
>>> 1024=chunk.txt:0:25.40
>>> 2048=chunk.txt:0:25.71
>>> 4096=chunk.txt:0:27.18
>>> 8192=chunk.txt:0:29.00
>>> 16384=chunk.txt:0:31.43
>>> 32768=chunk.txt:0:50.11
>>> 65536=chunk.txt:2:20.80
>>
>> What do you get with bs=512,1k,2k,4k,8k,16k...
>>
>>
>> Thanks!
>>
>> -- 
>> Al
>>
>> -
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>>
>
> root      4621  0.0  0.0  12404   760 pts/2    D+   17:53   0:00 mdadm 
> -S /dev/md3
> root      4664  0.0  0.0   4264   728 pts/5    S+   17:54   0:00 grep D
>
> Tried to stop it when it was re-syncing, DEADLOCK :(
>
> [  305.464904] md: md3 still in use.
> [  314.595281] md: md_do_sync() got signal ... exiting
>
> Anyhow, done testing, time to move data back on if I can kill the 
> resync process w/out deadlock.

So does that indicate that there is still a deadlock issue, or that you 
don't have the latest patches installed?

-- 
Bill Davidsen <davidsen@tmr.com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark