Re: SSD slowdown with 3.3.X?

[Mark Lord <kernel@xxxxxxxxxxxx>]

On 12-04-20 10:40 PM, Mark Lord wrote:
> On 12-04-19 10:07 PM, Joe Ceklosky wrote:
>> Mark,
>>
>>
>> Thanks for the info, but nothing like that shows up:
>>
>>
>> [jceklosk@neptune tmp]$ cat c-3.2.15
>> noop deadline [cfq]
>> noop deadline [cfq]
>>
>>
>> [jceklosk@neptune tmp]$ cat c-3.3.2
>> noop deadline [cfq]
>> noop deadline [cfq]
> 
> 
> Well, the stuff you posted (above) shows that cfq is being used
> instead of noop.  For SSDs, noop is the more natural choice,
> and used to be the default in the kernel for a while.
> I wonder when that changed?

Looking into the block layer now, I see that "cfq" at some point
became "SSD aware", which is probably when the default io scheduler
for SSDs changed back to cfq from noop.

Not 100% sure, but that's how it appears now.
I still have my systems set it to noop when an SSD is detected.

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