Slow disk I/O - was Re: Seeking Help [Ubuntu Bug??]

[Colin Law]

On 26 January 2013 21:25,  <Geoff at thebakershome.net> wrote:
>> On 26 January 2013 20:10,  <geoff at thebakershome.net> wrote:
>> ...
>> Plug in the SSD as well, but still boot 12.04 on the platter drive.
>> Then go to the SSD and exercise it with stuff that took a long time
>> before, assuming there was something other than apt-get that was slow.
>>  If necessary boot back on the SSD and find something else that is
>> slow first.  Obviously compare the times.
>
> There is no point. The platter drives are slow in 12.10 (compiling test
> done on these)
>
> Platter and ssd are slow on this computer with 12.10 but fast with 12.04.
> Same drives in computer with older hardware and both Ubuntu revisions work
> great.

You say there is no point doing the experiment, but then you provide
the results of the experiment (saying the ssd is fast with 12.04 on
the same mother board that we have been talking about).  So I am
confused.

Colin

>
> Either there is a bug in Ubuntu or the motherboard has an error reporting
> information that is ignored by 12.04, but impacts 12.10.
>
>
>>
>> Colin
>>
>>>
>>> I have 12.10 all setup the way I like, is there an easy way to move all
>>> that data to 12.04?
>>>
>>>
>>>> I do not know for sure. I get good benchmark sppeds in 12.10 as well.
>>>> The
>>>> problem is when dealing with lots of small files (apt-get update,
>>>> compiling many files, etc).
>>>>
>>>> I do not know how to properly test this from the live 12.04 disk.
>>>>
>>>> I moved some data around on the hard drives overnight. Tonight I plan
>>>> to
>>>> install 12.04 onto one of the platter drives. This should allow me to
>>>> to a
>>>> proper test of the same commands (apt-get update) and better compare
>>>> the
>>>> performance.
>>>>
>>>>>> I booted the 12.04 Ubuntu live disc and recorded some data.
>>>>>>
>>>>>> Disk Utility:
>>>>>>   All drives are detected as connected via SATA
>>>>>>     SSD Benchmark Results:
>>>>>>       Min Read Rate: 556.4 Mb/s
>>>>>>       Max Read Rate: 565.6 Mb/s
>>>>>>       Average Read Rate: 564.0 Mb/s
>>>>>>       Average Access Time: 0.1 ms
>>>>>
>>>>> Those are excellent results. So, are you saying the main issue is with
>>>>> the
>>>>> version of Ubuntu? That 12.04 works well, and 12.10 does not?
>>>>>
>>>>>
>>>>>
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