On 09/08/2011 03:28 PM, Dennis Jacobfeuerborn wrote:
> On 09/07/2011 10:55 PM, Jerry Geis wrote:
>> I grabbed a new SSD M4-CT064M4SSD2 from Crucial.
>>
>> I am disappointed. I stuck the unit in an Atom machine (zotac) with
>> CentOS 6 on the disk.
>> It really doesn't "feel" faster than the previous 5400 RPM drive that
>> was in it.
>>
>> The SSD is giving me (in the zotac running centos 6):
>> hdparm -t /dev/sda
>> /dev/sda:
>> Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec
>
> Not sure about Centos 6 but I just got a new System with a Crucial M4 128G
> disk and and the difference to my previous non-ssd system is *huge*:
>
> /dev/sda:
> Timing buffered disk reads: 700 MB in 3.00 seconds = 233.11 MB/sec
>
> And that's just the throughput. What really is amazing is the reduced
> latency which makes the desktop fly.
>
> 100mb/s sound really broken though. Even the slowest ssd drives should give
> you more than that. Try installing Fedora 15 (what I'm using right now) and
> if you see the same performance then it might be a hardware problem. If the
> performance is much better under Fedora 15 though then there might be an
> issue with Centos 6 and ssd's (though I'm not sure what that could be in a
> simple read-only benchmark).
This just occured to me: are you maybe cpu bound? Since you use an atom
based system maybe your system simply cannot deliver the full performance
of the drive?
Regards,
Dennis
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